How Do I Fix Operating System Wasn’t Found?

How do I fix Operating System wasn’t found?

Bring up the command prompt:

1. Boot from any DVD or USB Windows 7, 8, or 10 media.
2. Once you have reached the Windows Setup screen (where you select the Language, Time and Keyboard settings), press the SHIFT + F10 keys to bring up the Command Prompt.

How do I fix Windows 10 Operating System not found?

Method 1. Fix MBR/DBR/BCD

1. Boot up the PC that is having an Operating system not found error and then insert the DVD/USB.
2. Then press any key to boot from the external drive.
3. When Windows Setup shows up, set keyboard, language, and other required settings, and press Next.
4. Then select Repair your PC.