Help! windows suddenly won’t start because of activation

hey guys\gals, i need your help!
suddenly i can’t log in to windows xp (sp3).. i get this message:
This copy of windows must be activated with microsoft before you can log in. do you want to activate it now?
every wpa\genuine crack i tried didn’t work.. i’v tried Raider’s activation crack, it said ‘activated’ but when i rebooted i’v got the same message..
please help me! i don’t want to format and reinstall windows.. i’m sure there is a solution..
thanks in advance!
Answer #1
Can you change your product key? If yes: try another key, then try to crack again.
Answer #2
how do i change the product key? i think the activator does that..