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Keeping your virus scan software updated is a good idea. New viruses come out every day. But you might want to think twice this time. It turns out that the latest version of the popular McAfee VirusScan will cause your computer to freeze at start up - causing many users a lot of confusion. The exact version of the program causing these trouble is version 4.0.4102. And here is what you should do, if you would happen to have installed this version: Boot your computer and make it start Windows in "Safe Mode". This will prevent the McAfee program from executing upon startup. You can then disable McAfee VirusScan and reboot your computer.