if you dont remember the password or whatever just make a new account and acctivate the ps3 again (for games not videos). i think the games will play again after that.
OK, seeing as your a new member and recently we've had a swarm of pirates signing up looking for advice with their "free games", I'll cut the bull and get straight to the point.
I suspect you have been pirating games.
If you can prove to me otherwise (picture of signed and dated game disks or picture of signed and dated PSN purchase history) then we will help you fix your problem.