My sister recently recieved a computer from her school. Not long after she had it, a virus was found. Since we got it off, her computer has been acting wierd. When we try to close a web page, such as Yahoo, it just makes a little ding and wont close. It just stays open either way we try to shut it down, except when we Cntl, Alt, Delete. I think I need to update the computer so that it can have the critical updates it needs but I am not sure. That is the other thing. When I try to update the computer, I guess you can say it stays frozen on the screen that says to press "yes" to download the updates. That popup never comes up so it wont let me update.