1. Log in to your PC using an account with administration rights.
  2. Open the Start menu, type “regedit” into the search box and press enter.
  3. Navigate to the “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WPAEvents” directory in the registry.
  4. Double-click on the registry entry labeled “OOBETimer.”
  5. Change the current string of letters and numbers to “FF D5 71 D6 8B 6A 8D 6F D5 33 93 FD” and then hit “OK” to save the settings.
  6. Right-click on the “WPAEvents” folder and select “Permissions.”
  7. Deny permission access for the “System” listing and click “OK” to save the configuration. The Windows XP® activation notice is now disabled and removed. Your computer will now be activation popup free!