I downloaded AVG to remove a Trojan virus that was on my (Windows XP) computer. When I restarted my computer, like the program told me to, it came on, but I wasn't able to access any programs. Several of the desktop icons looked like white boxes. The mouse would move, but if I scrolled over the task bar it turned into an hourglass. I have tried removing the battery from the laptop and restarting it again. I don't know what else to try! Can anyone help me??