I had this simalar problem on a free XP pro machine I got used from work. I deleted the user account not knowing the administrator account was password protected. Some research led me to a little known tirck for resetting the password, it wasn't quick but it worked. I'll see if I can find the info again, it involves repairing the os install, & then at a certain point a set of keystrokes will get you into the user account & reset the passwords.
Edit: Try method 3 on this page, http://www.askvg.com/how-to-reset-re...ator-password/
it worked for my XP pro, worth a try on vista. This has been a loophole to reset passwords for some time, hopefully still works on Vista.
Another Edit: Another more detailed guide to same method http://pubs.logicalexpressions.com/P...cle.asp?ID=305Edited by Cvalley75 - 6/2/08 at 7:54pm