How to unlock my computer if I forgot the password?

I unlock my computer if I forgot the password?

Depends on what you mean by unlock. Try turning it off and restarting - then change the user password before the screen saver kicks in.

I have never used it but try this - http://ophcrack.sourceforge.net/

I have used this to recover the admin password for NT4 and Windows 2000.
http://home.eunet.no/pnordahl/ntpasswd/

the guy abobe needs to upgrade!!!
and if you cant logon wipe the system

"the guy abobe needs to upgrade!!! "

1. The guy above has been doing IT for a long time. You might assume that any experience with NT4 was involved with deploying and running it when it was the new kid on the block.

2. Sometimes you can't upgrade - an application might be written that only works in a given OS. Time marches on but funds are lacking to upgrade, yet the system is still required.

"and if you cant logon wipe the system"

That's great unless you have data on the system that you really need.

how do I unlock my computer if I forgot the password and I only have that one account on the computer