You could try doing a repair.
Put the windows installation disk in, boot off it. Press enter to setup a new installation, f8 to agree etc. Then it should search for previously installed versions of windows. When it finds the install choose the 'repair' option. It'll keep all the user data, so don't worry about that.
DON'T choose the first repair option (e.g. the first screen that pops up says 'press R to go to try a repair' or something. Don't do that, choose the 'press Enter to setup a new copy of windows' option)
You'll have to reactivate windows, but so long as you have the key it'll be fine.
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