It really can't be more annoying than this: when sitting in front of the computer and start it, it gives you back a message saying "Missing operating system" or "Operating system not found" on boot. The reasons for these errors are hard drive is corrupted, Boot record is corrupted, BIOs did not detect hard disk, missing or corrupted command.con, virus infection, etc.
Fix it, and you will find your operating system will become normal.
You can fix this operating system missing problem easily and effortlessly by yourself with Windows OS DVD (Windows 7, Vista, and XP). If you don't have a Windows OS DVD, I still have another solution for you.
1. Insert Windows OS DVD on your computer.
2. Click the key when you are asked to (to boot from DVD).
3. Then choose "Repair your computer", not "Install now", remember this.
4. Select the operating system after the installer searches for Windows installation, and click "Next".
5. Then click "Startup Repair". It will automatically fix problems that are preventing Windows from starting.
If all these are not helpful, your operating system must have been damaged deadly, and you have to take the last one to reinstall your Windows and Office.
If you are afraid of losing important files on your "System Operation is Missing" computer, Recoverit computer data recovery can help you recover data from computer hard drive with ease.
When your computer system has been missing, you should create a bootable media to help you enter the computer and retrieve your data back. Download and install Recoverit data recovery on a workable computer, prepare a USB drive or CD/DVD, and connect to the computer. Follow the next steps to creating a bootable media and get your data back.
Step 1: Launch Recoverit and select a data recovery mode. Please select the "System Crash Data Recovery" mode to start.
Step 2: Click the "Start" button to start creating bootable media.
Step 3: Select a mode to create bootable media. You can select a USB drive or CD/DVD， click the "Start" button to process.
Step 4: You will be asked to format the USB drive before creating a USB media drive. Make sure you have backup all important data, click "Format Now" to move on.
Step 5: It will take for a while to creating a bootable drive, please do not eject the USB flash drive.
Step 6: After USB bootable media or CD/DVD bootable media created, you will get the guide to recover your data back.
Step 7: You can follow the steps to recover data from the missing system. Preview the recoverable files and click "Recover" button to save data.
Technically, except for those damaged or overwritten files, all lost/deleted files on your computer/flash drive or memory card could be re-detected and recovered by Recoverit hard drive recovery software.