How to fix “Operating system not found error in Windows 7"
Repair Windows 7 boot errors to start up your computer without any problems
“Operating system not found”. It can be quite frustrating to see this error message flash on the screen when you start your computer. There could be various reasons for this glitch that prevent you from working on your PC. One of the possible reasons for this Windows 7 error could be a damaged hard disk drive. In such a situation, you may have to contact the manufacturer of your computer or the hard disk.
The “Operating system not found” error might also be encountered if the hard disk drive is not detected by the BIOS. To troubleshoot this issue, enter the BIOS Setup by pressing a function key which varies from manufacturer to manufacturer. Make sure that the hard disk is recognized by the BIOS in the settings.
If the Master Boot Record (MBR) in Windows 7 is corrupted, then also the system will not be able to boot. To restore the MBR, just follow these simple steps given here. As a precautionary measure to resolve Windows 7 boot errors, you can also create a Windows 7 Recovery Disk if it’s not provided by the manufacturer.