HOW TO PREVENT YOUR PC FROM VIRUSES ENTERING YOUR SYSTEM THROUGH PEN DRIVES Easy guide to save your computer from pen drive viruses- Ravmon Virus , Heap41a worm are some of common viruses and worms which are not detected by anti virus but normally spread via pen drives, when you plug them in your pc they infect your system. to prevent your PC from getting infected with Virus that spreads through USB devices, follow this short guide: Plug in your Pen Drive or USB drive to your computer . Don't choose any of the options that come in dialog box which appears, instead click Cancel. Now go to Start--> Run and type cmd, Command Prompt window will open. Now go to My Computer Check your USB drive letter. ( E.g. If it is Sandisk (I:) , then I: will be the drive letter .) In the Command Window ( cmd ) , type the drive letter: and Hit Enter . Now type dir/w/o/a/p and Hit Enter You will get a list of files . In the list , search for following files 1. Autorun.inf 2. New Folder.exe 3. Bha.vbs 4. Iexplore.vbs 5. Info.exe 6. New_Folder.exe 7. Ravmon.exe 8. RVHost.exe or any other files with .exe Extension . If you find any one of the files above , Run the command attrib -h -r -s -a *.* and Hit Enter. Now Delete every File using the following Command del filename ( E.g del autorun.inf ) . That's it . Now just scan your USB to ensure your Pen Drive free of Virus . I recommend using AVAST antivirus for scanning your computer. Enjoy!! And be safe.