HD works in one computer, not in the other

Hello. My main HD won't work on my main computer, it has "error 15 file not found". It works in my old computer and boots fine.

It appears the problem is caused by an old install of linux onto that drive. The accepted solution is to use the repair on the install disk and type into console bootrec.exe /FixMbr. It said it was successful but i'm still getting the same error. It then goes to a big red screen with grub command.

Please does anyone have some advice i'm going crazy here.

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