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.