There are at least two ways:
- The easy way: Log on with your alternative admin account, and
use it to reset the password to the primary admin account.
- The hard way:
http://home.eunet.no/~pnordahl/ntpasswd/bootdisk.html
(This is really scary stuff but it works)
If you have to follow the hard way, consider for a moment how many
key sets you have for your car, and why you would never consider
driving a car that has only one set of keys. The second set is usally
kept in a safe place, to be used in an emergency.