Microsoft started forcing all users to verify their Windows product was genuine this week after making the step an optional step for updates for several months. Within 24 hours, the code had been broken allowing users to bypass the verification.
The following was from the BoingBoing.net post where I first read about it:
Before pressing ‘Custom’ or ‘Express’ buttons paste this text to the address bar and press enter:
javascript:void(window.g_sDisableWGACheck=’all’)It turns off the trigger for the key check.