If you can replace Sticky Keys, sethc.exe, with Command Prompt, cmd.exe, and access it without being logged in, then you can use "Net User (Whatever the username is) *" and it will ask for a new password. You can't obtain his password this way, but this will allow you to log into the account. This really won't help if you're trying to be secret about it.
I wouldn't try anything if I didn't know what I was doing though.