[slavezero]

You can try this to remove admin password PC Hell: Change Administrator Password in Windows XP/2000/Vista

[Tpneer2]

you can also try this
at boot press and hold F8 if it will let ya get to the dos prompt type this
pwl?
assuming the shell is not damaged the password list file is brought up
if this works you should see a list of the passwords within the dos shell which will show the list that begins with the password for windows first since thats how you normally enter the hard drive