I don't know if it is already posted (sorry for that) Most virus nowadays transfer through our portable drives. It uses the autoplay function so that when you insert it to your pc it start automatically. How to disable autoplay 1.) Click Start>Run 2.) type gpedit.msc 3.) Under Computer Configuration Click Administrative Template 4.)Under Administrative Template Click System 5.)Under system look for "Turn off Autoplay" 6.) Double click it a window will pop up 7.) Under setting tab click enable 8.) In the turn off autoplay field choose All drives 9.) Click Ok Now your autoplay is disable thus preventing viruses to install automatically when you insert your portable drive.