forgot admin password

join a domain (or setup one on a different machine) and logon with the domain admin account, this account is automaticaly member of local administrator group.

If you cannot use the domain solution, there are several possibilities...

Take a look at:

http://home.eunet.no/~pnordahl/ntpasswd/

This utility is free and works under the concept of booting to a Linux boot disk then allowing you to change the password. It is not flawless, but works in many circumstances. Make sure to read over the information carefully...

Commercial solutions:

Locksmith at www.winternals.com - a bit spendy, but very good software.

L0phtcrack you can getit from www.atstake.com and it is the best password cracker out there. I know the GUI version is commercial, but I believe there is a free command line version as well.

Hope this helps! Good luck...