Microsoft wrote a KB article that can help.
http://support.microsoft.com/kb/940765/en-us
In short, boot from the DVD, choose Repair Option in the lower left corner
and follow the screens to the Repair Options.
Choose System Restore and Restore to a date before the administrator
password was changed.
CharlesE
"chezchat" <chezchat@xxxxxx> wrote in message
news

F69A3FA-F0A6-446A-9F9B-762A2B2610F4@xxxxxx
> Can anyone help. My has has for some reason re-set his Administrator
> password and forgotten what he set it to (don't you just love em) I have
> the
> Vista disc but don't know how to reload vista as when I try it still asks
> for
> the Admin password. All he can do as work on the internet as everything
> else
> asks for this password. I am afraid to experiment in case I mess
> everything
> up although he doesn't have anything saved or in files as he only had the
> system at Christmas. We got it from Mesh but I have tried without success
> to
> get help from their helpline, in fact I can't even get my calls answered.
> Any help would be gratefully received.