just crack it.
download ophcrack http://ophcrack.sourceforge.net/download.php
get the ophcrack Vista LiveCD link. download it and burn it with an iso buring program like imgburn.
then boot off the cd
After Ophcrack starts, locates the Windows user accounts, select one account and press the "Crack" button to crack password. it will take some time to crack unless you have a simple password. if your password is over 16 characters this wont work