After piracy misinstalled SP2, how to restore normal?

After Windows xp sp2 was introduced, many friends who installed the informal version of Windows XP could not successfully activate the system after installing SP2, and could not enter the system after 30 days of trial, even if Uninstalling SP2 does not work, you have to reinstall the system.

To avoid unnecessary loss, you can simply use a method to restore the system to SP1 without having to reinstall the system. But the first condition is to choose backup system restore when installing SP2. This way, you can uninstall SP2 in safe mode, then search the registry for the Wpaevents key and delete it.

Restart the system, select "Yes, I want to call the customer representative to activate Windows" when requesting activation, click "Next", enter the sequence provided by the customer representative in the third step in the AG. The 7 sets of numbers in the front of the number can be successfully returned to the SP1 state.