Hello apraba,
Please follow these steps for assistance:
Step 1 is to run the utility at this link http://go.microsoft.com/fwlink/?linkid=52012, then click the Windows tab, click the "Copy" button, then paste the report into a reply to this message: http://social.microsoft.com/Forums/en-US/genuinewindowsxp/threads.
Step 2 is to look on the computer or with the materials you received with the computer or with your retail purchase of Windows to see if you have a Certificate of Authenticity (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, or another edition or version of Windows?
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 printed on the CoA.
Not sure what to look for? See this page for reference: http://www.microsoft.com/resources/howtotell/en/coa.mspx
For great advice on all topics XP, visit http://www.annoyances.org/exec/forum/winxp