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The product key is a set of 5 5digit numbers that is unique to each copy of xp. If you are running a legal copy of xp and have lost your product key, you can find it by using a program called ProduKey. It is a free program from nirsoft. Go to www.nirsoft.com for the free download. I believe that you can download sp3 from the microsoft website, if your copy of xp is legit. If your xp is bootleg, then go to the store and buy a copy of xp. It is the proper way to do things. Dano
You cannot uninstall Windows Vista, but you can reinstall your previous operating system, which then replaces Windows Vista. To reinstall your old operating system, you must have the original installation disc. Back up your programs and files, insert the installation disc into your computer, and then reinstall the old operating system. To regain the hard disk space used by Windows Vista, reformat the disk during the reinstallation process. After reinstalling your previous operating system, reinstall your programs and files.