Raw,
Please follow these steps for assistance:
Step 1 is to download and run the utility at this link http://go.microsoft.com/fwlink/?linkid=52012, then click the Windows tab, Copy to Clipboard, then paste the report into a response in this section of the forum: http://forums.microsoft.com/Genuine/ShowForum.aspx?ForumID=442&SiteID=25 The section of the forum you are in now is only for Feedback and Comments.
Step 2 is to look on the computer or with the materials you received with the computer or with Windows to see if you have a Certificate of Authenticty (COA). If you have one, tell us about the COA. Tell us:
1. What edition of Windows XP is it for, Home, Pro, or Media Center?
2. Does it read "OEM Software" or "OEM Product" in black lettering?
3. Or, does it have the computer manufacturer's name in black lettering?
4. DO NOT post the Product Key.
Not sure what to look for? See this page for reference: http://www.microsoft.com/resources/howtotell/en/coa.mspx