How to Upgrade to Windows 11 from Windows 10, 8.1 or 7

TL;DR:

Eligible 64-bit Windows 10 PCs can perform a free, file-preserving in-place upgrade to Windows 11 using Windows Update, while migrating from Windows 7, 8, 8.1, or any 32-bit system requires a newly licensed clean installation that will delete existing applications.
    ● Confirm mandatory hardware requirements including TPM 2.0, a 64-bit processor, and UEFI Secure Boot capability using the PC Health Check app before making any firmware changes.
    ● To successfully retain personal files and installed apps on a supported Windows 10 PC, you must execute the setup from Windows Update, the Installation Assistant, or a mounted ISO directly from inside your existing operating system rather than booting into a USB installer.
    ● Downgrading or retrieving legacy files from the C:\Windows.old directory is restricted to a limited time window, typically 10 days post-upgrade, so verify your active sign-in profile and external backups before initiating third-party data recovery software.

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To upgrade to Windows 11, first identify your current Windows version, check whether the PC is supported, and decide what must survive the installation. An eligible Windows 10 PC can use a free, file-preserving upgrade. Moving from Windows 7, Windows 8 or Windows 8.1 is a different project: plan for compatible hardware, a valid license, a backup and reinstalled applications.

The most important choice is not USB versus ISO. It is starting an upgrade inside your existing Windows installation versus booting into a clean installation. Choosing the wrong path can remove the apps and files you intended to keep. The sections below help you make that decision before selecting Install.

Part 1. Choose the Right Windows 11 Upgrade Path

Start with the outcome you need. Keeping installed applications requires a supported in-place upgrade, not simply a copy of your Documents folder. A backup protects your files, but it does not turn an unsupported upgrade path into a supported one.

Microsoft's Windows 11 upgrade FAQ confirms that the upgrade from Windows 10 is free for eligible devices. Internet charges, additional storage, replacement hardware and a separate edition upgrade are different costs. A free Windows 11 download is not a license for an otherwise unlicensed PC.

Version numbers need context, too. As of October 14, 2026, Microsoft's Windows 11 release information lists version 26H2 as a general-availability release. Use the supported release offered for your device rather than an old preview ISO or an installer found on an unrelated download site.

Windows 10's standard support ended on October 14, 2025. For eligible personal Windows 10 devices that need more transition time, Microsoft's current end-of-support guidance lists Consumer Extended Security Updates through October 12, 2027. Enrollment conditions apply; this is a temporary security-update option, not a way to satisfy Windows 11's hardware requirements.

Part 2. Check Compatibility and Protect Your Files

Compatibility and backup answer different questions: can the PC run Windows 11, and can you recover your own work if the change goes wrong? Complete both checks before starting an installer or changing firmware settings.

The official Windows 11 system requirements include a compatible 64-bit processor, at least 4 GB RAM, a storage device of at least 64 GB, UEFI firmware with Secure Boot capability, TPM 2.0, compatible graphics and a suitable display. Home and Pro for personal use require internet connectivity and a Microsoft account during initial setup. Do not judge CPU support solely by a label such as Ryzen 3 or an approximate Intel generation.

Before continuing, prepare the following:

• A verified backup: copy important local files to external storage or confirm your cloud copies are complete and accessible. Include project folders, Downloads and files outside the usual user folders. Open several copied files to test the backup.
• Your account and encryption information: know the Windows sign-in password and make your BitLocker recovery key accessible from another device or a safe offline record before firmware changes.
• Application and device support: check essential software, printers, specialist equipment and the PC manufacturer's Windows 11 support. Keep installers and license information for applications you may need to reinstall.
• Power and working space: connect laptop power and leave enough free storage for Setup. A 64 GB storage-device requirement does not mean every installation needs exactly 64 GB of free space.

A backup on another partition of the same physical disk is not a substitute for an independent copy when the disk itself might be erased or fail. Readers planning a clean installation can use the backup-before-reformatting checklist to identify files that are easy to overlook.

Check Eligibility with PC Health Check

Use PC Health Check on a Windows 10 PC to identify the specific hardware requirement that needs attention. It is an eligibility check, not a guarantee that every application, accessory or future update will work.

Step 1. Obtain the app through Microsoft's PC Health Check instructions. Install or update it, then open the app.

Step 2. In the Windows 11 section, select Check now. Read the overall result and any individual requirements shown.

Step 3. Record the failed requirement before changing anything. A TPM warning needs a different response from an unsupported CPU or insufficient storage.

Check the result: proceed only when the hardware requirements pass. If the app cannot run on a legacy Windows installation, compare the machine's specifications with Microsoft and the manufacturer's documentation instead of assuming compatibility. A passing result does not mean you should bypass an update safeguard.

Resolve a TPM 2.0 Warning Safely

A missing TPM message can mean that a supported firmware TPM is disabled, but it can also mean the required hardware is absent. Microsoft's TPM 2.0 guidance distinguishes checking its status from enabling it.

Step 1. Press Windows + R, enter tpm.msc, and check the status and specification version. If the TPM is ready and the version is 2.0, leave its configuration alone.

Step 2. If the TPM is unavailable or disabled, use your exact PC or motherboard model's support instructions to check for a supported TPM. On Windows 10, firmware access may be available through Settings > Update & Security > Recovery > Advanced startup > Restart now, followed by Troubleshoot > Advanced options > UEFI Firmware Settings.

Step 3. Enable only the documented TPM setting. It may be called Intel PTT, AMD fTPM or another manufacturer-specific name. Save the change, restart and repeat the status check.

Stop condition: do not select Clear TPM, reset security keys or install an arbitrary BIOS update as a generic fix. If the model does not support TPM 2.0, or its documentation is unclear, obtain manufacturer guidance rather than experimenting with encryption-related settings.

Check UEFI and Secure Boot Without Breaking Startup

Microsoft specifies Secure Boot capability for the upgrade; capability and the current enabled state are not identical. Its Secure Boot guidance recommends enabling the feature for security, but a blind boot-mode change is not an appropriate first response.

Step 1. Search for System Information, open it, and inspect BIOS Mode and Secure Boot State. Record the values before entering firmware settings.

Step 2. If Windows is already using UEFI and the manufacturer supports Secure Boot, follow the model-specific instructions to enable it when needed. Keep the backup and recovery key available.

Step 3. Restart into Windows and check the values again. Confirm that the PC starts normally and re-run the eligibility check.

Stop condition: if BIOS Mode is Legacy, do not simply disable CSM or switch to UEFI. The boot mode and system-disk layout need to be compatible. A storage-layout conversion is a separate operation that requires its own preparation and validated procedure; it is not a checkbox in this upgrade guide.

Part 3. Upgrade Windows 10 to Windows 11

The following methods are alternatives, not a sequence of three installations. Start with Windows Update. Use a manual method only after checking eligibility, the current release's known issues and the reason an automatic offer is absent. A work- or school-managed PC should follow its administrator's deployment policy.

Method 1. Upgrade Through Windows Update

This is the preferred route when Windows offers the upgrade to your supported PC. Microsoft's installation guidance recommends waiting for the Windows Update offer rather than treating a manual installer as the default.

Step 1. In Windows 10, open Settings > Update & Security > Windows Update. Select Check for updates and complete any required restart.

Step 2. When the Windows 11 upgrade offer appears, read it and select Download and install. Do not select a Windows Insider channel or enable optional diagnostic data to obtain the normal public release.

Step 3. Accept the applicable terms, allow the download and schedule or start the restart when prompted. Keep power connected and do not interrupt the installation.

Verify: after signing in, run winver from Windows search to confirm Windows 11. Open a document, an important application and a device you depend on. A desktop that appears normally is only the first check.

If no offer appears: do not assume Windows Update is broken. Read the specific compatibility or policy message and use Part 5 to decide whether waiting, an OEM update or another supported route is appropriate.

Method 2. Use Windows 11 Installation Assistant

The Assistant is a manual option for a supported x64 PC. Microsoft's download page currently requires Windows 10 version 2004 or later, administrator access and at least 9 GB free for the download. Setup can require additional working space. The Assistant does not run on Arm-based PCs or provide a Windows 7/8 upgrade path.

Step 1. Open the official Windows 11 download page. Under Windows 11 Installation Assistant, select Download Now. Choose this section, not the similarly named media-creation download.

Step 2. Run the downloaded Assistant as an administrator. Let it check compatibility. If a requirement fails, resolve that requirement rather than searching for a bypass switch.

Step 3. Review the license terms and select Accept and Install. Allow the download and installation stages to finish.

Step 4. Use Restart Now when the Assistant is ready. Keep the computer powered while it restarts, then verify the Windows version, files and essential applications.

If it stops: record the error, available disk space and stage reached. Do not repeatedly restart the installer over an unresolved compatibility warning. For a model-specific reference, ASUS documents the Windows Update and Assistant workflows; use Microsoft's current eligibility and release guidance rather than older rollout dates in OEM articles.

Method 3. Run Setup from a Mounted Windows 11 ISO

An ISO is a container for installation files. For an eligible Windows 10 PC where you want to retain applications, start Setup from inside Windows. Microsoft's installation-media instructions distinguish this from booting the computer into a clean install.

Step 1. From the official download page linked above, obtain the Windows 11 ISO that matches the PC's architecture and installed Windows language. Check the existing edition and intended license before proceeding.

Step 2. While signed in to Windows 10, right-click the ISO and choose Mount. If the option is missing, open the ISO with Windows Explorer or use its Properties dialog to change the associated app to Windows Explorer.

Step 3. Open the mounted drive in File Explorer and run setup.exe. Review the compatibility checks and continue only after any blocking issue is understood.

Step 4. At the final installation summary, confirm that Keep personal files and apps is selected. Use Change what to keep to inspect the alternatives before committing. The example shows Windows 11 Pro; your installation must match your own edition and license.

Step 5. Select Install only when the edition and retention choice are correct. After the restarts, verify Windows 11, sign in to the original account, and test representative files and applications.

Stop condition: if the option to retain apps is unavailable, cancel and review the starting OS, architecture, language, edition and media. Selecting a files-only option does not preserve installed applications. Booting from USB will not restore a missing in-place retention option.

Part 4. Move from Windows 7, 8 or 8.1 to Windows 11

An upgrade from Windows 7 to Windows 11, or a move from Windows 8/8.1, should be planned as a migration rather than the Windows 10 procedure with a different first click. Protect your data before evaluating installation on the old machine.

Understand the License and Data-Retention Limits

There is no generally available Windows 7-to-11 or Windows 8.1-to-11 free-upgrade offer. Microsoft's legacy Windows migration guidance describes purchasing a full Windows 11 license for compatible hardware or moving to a supported PC. It also warns that applications need reinstalling and files need transferring.

Do not confuse these three questions:

• Can the hardware run Windows 11? A valid license does not remove CPU, TPM or firmware requirements.
• Does the device already have a valid applicable license? An old Windows 7/8 key is not a promise of a new free Windows 11 entitlement. Check any existing digital license separately.
• Can Setup preserve this installation? Possessing an ISO does not create a supported direct legacy-OS in-place upgrade.

Windows 11 is 64-bit only. Microsoft's 32-bit and 64-bit Windows FAQ explains that changing architecture requires reinstalling Windows and applications. A 64-bit-capable CPU alone does not establish Windows 11 eligibility.

Install on a Compatible PC or Move to a New One

Use a clean installation only when the hardware is supported, licensing is settled and the backup is complete. For an incompatible old PC, the safer alternative is a supported replacement: transfer verified files and reinstall applications there instead of modifying the old machine to evade checks.

Step 1. Finish the external backup and test it. Record the required Windows edition, account information, application licenses and the exact destination disk. Disconnect the backup drive before the destructive installation stage.

Step 2. On a supported working PC, open the media-creation tool from Microsoft's download page above. Accept the terms, confirm the installation language and edition, choose USB flash drive, and select the intended empty USB drive of at least 8 GB. Its contents will be erased; check its name and capacity before continuing. Wait for media creation to finish. The x64 tool is not an Arm installation workflow.

Step 3. Start the destination PC from that USB using the manufacturer's supported UEFI boot procedure. Confirm the language and keyboard, then choose Install Windows 11. Read the acknowledgement that files, apps and settings will be deleted. Accept it only for the intended clean installation after the backup is verified.

Step 4. Follow the activation prompts using your valid license or applicable digital license, and choose the matching Windows edition if asked. At disk selection, identify the intended installation disk or partition by its size and layout. Proceed only after identifying it confidently. Do not follow a blanket instruction to delete every partition on every disk.

Step 5. Complete setup, install supported OEM drivers and Windows updates, and confirm activation. Reconnect the backup, restore your files and reinstall supported applications. Open the restored files before deleting any backup copy.

If something does not match: stop when the target disk is missing, the partition choice is uncertain or the hardware fails eligibility. A missing drive may require the correct manufacturer storage driver; it is not permission to format another visible disk. Keeping the old working PC unchanged until the new environment is verified gives you a practical fallback.

Part 5. Handle a Missing Upgrade Offer or Failed Installation

An unsuccessful attempt does not tell you which layer failed. Match the actual message to a next action before changing the boot configuration, uninstalling software or retrying with different media.

A Windows installation failure in the SAFE_OS phase deserves its own error-specific diagnosis. Keep that investigation separate from a clean install: the latter may remove the evidence and data you still need.

After a successful upgrade, check activation, networking, important applications and your backup. Microsoft's Go back option is normally available for a limited period, commonly 10 days, provided the required previous-installation files remain. Preserve any new work before using it. Rolling back does not restore Windows 10's expired standard support.

Part 6. Find Missing Files Before Trying Data Recovery

Missing desktop icons or an unfamiliar Documents folder do not prove that files were deleted. First establish whether the files still exist under another account or storage location. If deletion is confirmed, avoid writing more data to the affected drive.

Check the Original Account, Cloud Copies and Backups

Microsoft's missing-files guidance after an upgrade starts with account and search checks, then backup recovery. Use those reversible checks before scanning for deleted data.

Step 1. Confirm that you signed in to the original Windows account. A temporary-profile warning, such as the Windows 10 example below, means you are not using your normal profile. Windows 11 places account settings differently, but the same warning is a reason to check the account before assuming deletion. Preserve any new files created in a temporary session before signing out.

Step 2. Search for a known filename and inspect the original user folders under C:\Users. Check whether the expected folders are now under OneDrive and confirm the account used there.

Step 3. Check the external backup and cloud copies. If C:\Windows.old\Users exists, inspect the relevant old profile for needed files before running cleanup. Microsoft describes a limited Windows.old file-retrieval window, normally 10 days after the upgrade; copy needed files to independent storage promptly. Do not rely on Windows.old as your only backup or assume every installation creates it.

Verify: open the actual document, photo or project from its recovered location. A shortcut or matching filename is not proof that the contents are intact. If the file is present but will not open, treat that as a possible file-corruption problem rather than repeatedly searching for a deleted copy.

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When previously saved files are genuinely lost and no usable backup remains, Recoverit Windows Data Recovery can scan a detected storage device for recoverable files. It is not required for a normal Windows upgrade and does not make unsupported hardware compatible.

Minimize use of the affected drive. Avoid installing recovery software or saving recovered results onto it. If Windows no longer starts, a separate crashed-PC file recovery workflow may be appropriate before reinstalling Windows. A drive that disconnects, makes unusual noises or cannot be detected needs a different assessment.

Step 1. Open Recoverit and select the drive or location where the missing files were stored. The official Recoverit Windows guide shows the location-selection, scanning and preview workflow.

Step 2. Scan that source and narrow the results using the available file-type, path and search filters. Preview supported files to check that the result is relevant.

Step 3. Select the needed files, choose Recover, and save them to another physical drive. Open the saved copies in their normal applications before considering the recovery complete.

Recovery limits: overwritten data and data already removed through SSD TRIM may not be recoverable. Encryption still requires the appropriate unlock information. A scan cannot guarantee the original folder structure or complete files, and recovery software does not replace a verified pre-upgrade backup.

Conclusion

The right Windows 11 upgrade begins with the starting system, not the download button. For an eligible Windows 10 PC, prefer Windows Update and confirm what the installer will retain. For Windows 7, 8, 8.1 or a 32-bit installation, plan a licensed migration or clean installation with independent backups and application reinstallation.

Check the finished system before removing your fallback copies. If files seem missing, establish their location first; use data recovery only for genuine loss. That order protects your work while keeping the upgrade, troubleshooting and recovery tasks separate.