Well, it is very obvious that all the pc will not have a genuine XP installed.The reason is simple if there are copies available then who would try to buy the original CD's.
In majority of the cases this ingenuine copy installed on our PC works quite succesfully, only sometimes we might face the problem while installing some softwares or other kinda of things.
So here i present the crack for validating your Xp copy at no Cost :)
All you have to do is to download the following crack from http://rapidshare.com/files/200472699/Windows.Genuine.Advantage.Validation.v220.127.116.11.CRACKED.7z
and Run the installer.bat file.
If still having any problems, Write it Down..