After repairing Windows XP or after replacing a motherboard, you might receive this error before logging in "This copy of windows must be activated with microsoft before you can log on."

  • Download this patch which works for Windows XP Home and Prof.
  • Reboot to Safe Mode.
  • Open the downloaded file and double-click AntiWPA3.cmd
  • Click Yes when it prompt.
  • That should be it.
  • Restart the computer and you should be able to login now.