last night when i thought i turned my computer off i clicked on shut down then turned my monitor off, but when i woke up this morning and went to turn my comp back on i noticed that uit never turned off. it was saying that i someone else was using the computer and if i shut down now they would lose all there work they didnt save.(or something like that) so i clicked shutdown anyway then i logged back on and went to look at my user accounts which im suppose to be the only user but it was another user account limited account and password protected. if i delete it will tha take care of it? and how can i see what they did on my computer?