|First we will need more information.|
Was this the original hard drive? Was the original OS Windows XP? Was the original idea to put windows on it's own partition, or was this an image from an original hard drive that was put on a newer one? What is on the rest of the hard drive: Are there other partitions, or is it blank space? Are there programs and/or files on the other partition(s)? What computer? Probably more questions, depending upon these answers.
You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.