if you ever wanted to hack in xp account here is the trick for you!
1 . Boot anyone's xp computer who has a limited account active (i.e. guest) When you boot, boot to safe mode w/ dos prompt. (push F8 during startup) Type
C:\cd windows\system 32
2. While still in system32 type:
command userpasswords2
3.Then unselect the box that says "this computer requires a password etc."
Reboot!
You just hacked XP