And by crached U mean? Errors, blue screens, restarts?!?! How far does it open?
Can U get in safe mode or not? Or only in bios?
Acer E-recovery? if I remember right, the default should be six zero's.
If not, maybe U can recover the password in safe mode or recovery console(for recovery console you'll need to borrow/buy an xp cd). U should search for a aimdrs.dat file and try opening it with a text editor. There you should find your password.