not really sure what you would be able to do under an account that's not set as administrator. i've always been the one to set up everything on everyone's computers, so of course i gave myself unlimited access to everything. i ususally even know everyone's passwords to e-mails and everything.
but, the only way i know for sure that you can access and change stuff around is a total format and reload
and i don't think you would want to do that
lol