Hello Akshey sarsir,
I'm going to make the assumption that your computer is alerting you to the fact that there is a nongenuine installation of Windows XP installed on it.
Using nongenuine Windows potentially can expose your personal information to risk of loss or compromise, and the WGA Notice is there to remind you that it's best to run Genuine Windows to avoid that increased risk. For this and other reasons,
Microsoft does not support the uninstallation or removal of the Windows Genuine Advantage Notifications Utility.
Please see this web page for more information:
http://windows.microsoft.com/en-US/windows/genuine/about
In order to receive the best support, we request all users initially download and run the Genuine Diagnostics tool at this link
http://go.microsoft.com/fwlink/?linkid=52012. Click "Run" several times to download and start the Utility. When asked, click the "Continue" button. When the utility completes its run, click
the "Copy" button, then come back here and paste the report into your post.
Also, please look on the computer for a Certificate of Authenticity (CoA). If there is a CoA, please tell us what version and edition of Windows is listed on the CoA, and if there is a manufacturer's name or "OEM Software" or "OEM Product" printed
on the CoA. Do not post the product key printed on the CoA.