ok...a family member logged on the computer earlier today, and a window poped up that said 'Computer Locked, only admin can login'. When I tried to type in the admin username and password, the fields were disabled, so I couldn't type anything in. I have no idea why this happened, and was wondering if everything is OK with the computer. I couldn't do anything else on the computer, so I just hit the power button and it shut down properly. When I logged back on, everything seemed to be normal. Is this ok to happen?