I think my computer has just been infected with some type of virus. I am running Windows Vista Home Premium 64-bit. When I get to the log on screen, I input my password and it takes me to my desktop. After about 30 seconds, an unusual icon appears in the system tray. It is a gray circle that seems to be broken up into small squares inside. I have no clue what that. My brother says that it looks similar to the Adobe Acrobat system tray icon. As soon as it appears, my computer freezes. I can't access anything. The only thing I can do is press Ctrl+Alt+Del. When I do that, I can choose to start the task manager but that does me no good. The task manager does come up but it is completely untouchable. I can't end any processes or anything. The entire dialog box is frozen. The only real option I have is to log off from the screen that comes up in Vista when you press Ctrl+Alt+Del. In the approximately 30 seconds that I have between log on and complete freeze, I tried to figure out what process it was in task manager which caused my computer to freeze. I really couldn't find anything that appeared when that icon appeared. I'm not sure what to do. I managed to get AVG to start scanning my computer in that 30 seconds that I had but I'm not sure if I'll be able to do anything with it once the scan is complete. What should I do? By the way, I am writing this message on my Windows XP on another computer in my house.