I have 3 user accounts, excluding the guest account and over the past few\nweeks, pop ups, a slow computer, task manager, and the alt+ctrl+delete\nstopped working. Every time i try to access the task manager or change a\nsetting, screen pops up that says the computer administrator has denied it or\nsomething like that....I thought I was the only administrator but going into\nsafe mode, i found that there's an administrators account that was set up\nwithout my knowledge. I think my computer's been hacked. How can i get rid of\nit?!?!?