Missing Operating System or Operating System Not Found

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If Windows Is Missing in your Windows Computer.

If you frequently get the following message while booting Windows Vista or 7:

Missing Operating System
or
Operating System Not Found

and you need to boot with the disk, and repair, here is what you can try.

Boot the Windows 7 or Vista DVD, choose "Repair"
Open a Command Prompt.
Enter the following commands:

bootrec.exe /fixmbr
bootrec.exe /fixboot
bootrec.exe /rebuildbcd

Hit Enter.

Reboot.
This should hopefully, have made your problem go away !