1.you can go into safe mode (F8 at logo when booting up) and enter as administrator and then go to accounts and change windows password and that's with XP. I haven't forgotten password for a pc before but can enter any XP pc in safe if the owner hasn't gone into safe mode and designated a password for "administrator" and usually only have a password for the user account but never have tried on Vista or Win7.
2.if that does not work,you can use software to reset the windows password I know a windows password tool just like below Windows Password Key 8.0
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