Make sure that you do the following on your computer or another computer with the owners permission only.
XP:
1 >> Log into safe mode
2 >> Log in as the computer Administrator, "Administrator" for the username
3 >> Leave the password blank
4 >> Control panel and change the password for your account
If that does not work:
All Version:
1 > Get Trinity Rescue Kit
2 >> Download the ISO version - http://trinityhome.org/Home/index.php?wpid=5&front_id=12
3 >> Burn the ISO to a CD using an ISO burner
4 >> Bootup from the CD
5 >> Remove the password
If you don't want to change the password:
1 > Get a program called Ophcrack
2 >> Download the liveCD (ISO) - http://www.ophcrack.sourceforge.net/
3 >> Burn the ISO to a CD using an ISO burner
4 >> The Live CD's come with the free rainbow tables, so you might need to download other tables (cost money)
4 >> Bootup from the CD
5 >> Crack the SAM and System file
Dane