Originally Posted by andyhardy
Can you not log in via Safe mode and go to Start -> Run -> Type 'control userpasswords 2' hit enter?
If you can't get into the User Accounts section in Control Panel then try the above out.
I don't actually know if you can get to that dialogue box through any of the menus - I've never tried.
That menu has proven very useful to me when rebuilding my PC from an old hard drive locked out by Windows security!
Cheers,
Andy