Windows XP activate
1.Go to "Run" and type REGEDIT
2.Now expand
HKEY LOCAL MACHINE-> SOFTWARE-> MICROSOFT -> WINDOWSNT->currentVersion->WPAEvents
On the right double click on "OOBETimer"
In that (OOBETimer) delete everything (Text) & press ok
3. Go to "Run" and past this
%systemroot%\system32\oobe\msoobe.exe /a
Then choose "Yes I wish to call"
Click on "Modify Product Key"
Enter the followin Key
THMPV-77D6F-94376-8HGKG-VRDRQ
Then click "update"
Then click "Remember Later"
Restart Windows.