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The cleanest install would be to assemble the new computer with whatever parts you want and install a fresh copy of Win XP onto a formatted drive.
Back up all of your files from one of the drives (to the other one if enough space is available) and format that drive with the Win XP cd.
Just pulling a hard drive with an operating system on it from one computer to a new one with different components is a recipe for a lot of headaches.
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