How do I fix error Operating System Not Found in Windows?

The error of Operating System not Found can be resolved by following the following steps:

  1. BIOS/UEFI Check boot order to ensure that your hard disk is first.
  2. You need to reconnect your hard drive to make sure that it is connected.
  3. Reboot into windows using a USB windows installation: Reboot into windows with a USB windows installation:
  4. Booting using USB Drive - Select Repair your computer -Troubleshoot- Command Prompt- bootrec /fixmbr and bootrec /fixboot.
  5. Diagnose Hard disk problems by running chkdsk in Command Prompt.
  6. Windows may be installed again as a final resort.
 
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