Well I'm having a brain fart!
I think my brother is going on my computer when I'm at work. Yes I have a password on it but I think he keeps getting on. I know you can go in and see when a user has logged in and so on, if you are the admin. I can't seem to remember where to go for that, or Windows 7 is different then XP.
I just need to know when people have logged on.