XP? XP is dead. It died less than a year ago. Unless you are a risk taker and installing the unofficial sp4 patch based off Windows POS Ready 2009, or are a retrogamer playing games that wont run on Vista or newer, or are willing to replace it with Linux, there is no good reason to keep XP on your computer. Vista wasn't too bad after SP1, and I think Microsoft still gives it security updates, so there is no good reason to downgrade to XP. If anything, you should have upgraded to 7 or newer.

Oh, and necrobump -.-