Admin Password reset in regedit

I have a laptop with Vista Business on it.

There are two accounts, one Admin and one User.
I can log into the user as i know the password but have forgotten the
Admin password. I cannot perform tasks such as cleanup etc as it always
prompts me for the admin password, which i do not know. I have tried all
of the other suggestions and still get prompted for the forgotten
password.

I recently had a similar experience on my desktop, where the admin
password was not recognised and i was not allowed to log on, and i
accessed the regedit to reset from there. I have tried to follow these
steps again with no success. Any suggestions. I am keen to do it in
regedit as i know this already.

Can anyone direct me to somewhere that could help?

You can use METHOD THREE in the tutorial below to reset your password.

there are some methods I found.
You can access the Administrator account through the login prompt
without logging into safe mode. If the computer utilizes the welcome
screen instead of the standard NT domain login prompt, you can press
Ctrl + Alt + Del twice to get to the login prompt. This is only true if

you are running Windows XP Professional Edition. Windows XP Home
Edition
will also allow you to use this method to log on.
If it doesn't work above , you can try to use"windows password key 8.0
"to get back the password !