Wanted to bump the topic for an addition:
http://ebcd.pcministry.com/
It's called EBCD - Emergency Boot CD. At work, a computer had an administrator password on it, but the user had forgotten it. It
had been set to autologon, but when this got changed, we couldn't get back into the computer.
Went to my station and googled around, found the above. You download a small program (18 megs I think), extract it, then run a make-iso program. It creates an iso, which you then burn to a CD. Then just pop it into any computer and let it boot from there.
It creates a pre-OS Linux environment, useful for doing a variety of things. I used it to erase the Admin's password on the aforementioned computer, subsequently gaining access back into an otherwise completely locked down computer.
Granted, it is command line (no GUI), so you have to read what is on the screen to see what is up. But it was able to determine all the users on the first machine AND tell me how many attempts to login to each one had been tried, etc. Looks like the Admin account's pw actually got corrupted and had locked out any attempt, but this program was able to erase it and get me back to a blank slate.
I have since learned of a small option inside User Accounts that allows you to create a bootable floppy disk that can prevent forgotten passwords, which is a nice thing to have, except that most machines don't have A: drives anymore.
Anyway, EBCD is neat, I'll definitely be carrying copies around with me whenever I'm working on computers now.