I just bought a workstation, and bought the newest version of avast for security. Once the software finished downloading, the computer restarted as it is supposed to. However, when I go to turn on my computer, my monitor remains shows the windows symbol, and then just goes blank/black. I tried the f12/f9 trick but dont know much about the BIOS. Any help would be great. -do you believe I may have downloaded a virus? thanks.