This may help. see link below:
http://home.eunet.no/~pnordahl/ntpasswd/bootdisk.html
"Ginger at Treofan" <Ginger at
> wrote in
message news:6EAFDA84-3CD2-4BB1-B1B4-...
> My Windows Vista Home Edition password expired and I can't get in. I tried
> to
> change the password but it says my current username or password is
> incorrect.
> I've tried typing the password in several formats, i.e., uppercase,
> lowercase, title case. Nothing works. I don't have a password reset disk
> nor
> do I have any other user accounts on the system. Is there something short
> of
> reinstalling the operating system to resolve this? I have a PC and a
> laptop
> networked through a wireless router.