HackersWarrioR: You are talking about Win9x boxes... he/she/it asked about Win2000
That's completly something else.

There are a few options as mentioned above.
You can also use the ERD (emergency repair disk) for your Win2K / NT Box to search the password hash (the sam) and recover some stuff.

But if it's not your box / account, then your behavior is called "cracking"
Something what's not very appreciated specially at this site!