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I have a Windows 7 dvd but when I try all the methods of repair none of them work. My main OS that is currently 'missing' is Windows 8 with Ubuntu dual boot.

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Are you sure you want to fix the MBR (master boot record) and not the boot loader? If there is not MBR (or EUFI/GPT) then you can not boot at all. Reading your question I had the impression that you could load Ubuntu but not win8 – Hennes Jul 18 '12 at 22:26
    
So you cannot see windows 7 in the grub list? – Sandro Dzneladze Jul 18 '12 at 22:27
    
I don't have the option to boot Ubuntu or Windows, so I need to fix the MBR. How do I do this? – brennan Jul 18 '12 at 22:30
    
You really need to better describe the problem you are having. – psusi Jul 19 '12 at 1:05
  • Windows 7 (winPE) environment: After selecting repair cmd prompt type BootRec.exe /fixmbr

Edit1 after the comment: When I typed that command in the CMD it said it was completed successfully but when I try to boot from my HD it still says "Missing Operating System"

What happens if you replace /fixmbr with /FixBoot. This writes a boot sector onto the system partition to start Windows.

Alternatively try /ScanOs and /RebuildBcd.

NB: this also means your problem is not with the boot sector.

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When I typed that command in the CMD it said it was completed successfully but when I try to boot from my HD it still says "Missing Operating System" – brennan Jul 18 '12 at 23:54
    
When I did /RebuildBcd it said it added windows.old but not windows. Nothing was there when I tried to boot from HD. I'm just going to put some files to a USB and then re-install Windows. – brennan Jul 19 '12 at 0:32

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