VALIDATE WINDOWS XP 1.go to run. type regedit. 2.go to HKEY_LOCAL_MACHINE - SOFTWARE - MICROSOFT - WINDOWSNT - CurrentVersion WPAEvents. 3.double click on OOBETimer 4.delete everything u can in that windows. 5.go to regedit and type %systemroot%\system32\oobe\msoobe.exe /a 6.choose 'i wish to call' 7.choose 'modify product key' 8.put THMPV-77D6F-94376-8HGKG-VRDRQ 9.Click update 10.press remid me later 11.restart 12.go to run, type the same (%systemroot%\system32\oobe\msoobe.exe /a) 13.there you will see 'windows activated' 14.press OK to exit FROM NOW ON, YOU CAN UPDATE YOUR WINDOWS FOR FREE!