An easy way for computers get a virus is from the use of pen drives (also known as USB devices or flash drives). Many viruses like the Ravmon virus and Heap41, which is a worm, are not detected by the usual anti-virus software. These viruses spread rapidly through USB devices. So here's a tip to eliminate the virus.

1. Plug your pen drive or USB device to the computer.

   
   




2. After a few moments, a dialog box will pop up. Ignore this dialog box by clicking Cancel.

   
   




3. Now go to Start --> Run and type cmd to open the Command Prompt window.

   
   




4. In the Command window, type the USB drive letter and then press Enter. For instance, the drive letter for your USB device may be “E:” In this case, type “E:” in the Command window and press Enter.

   
   




5. Then, type dir/w/o/a/p and press Enter.

   
   

You will now get a list of files. In the list, see if you have any of the following:

Autorun.inf

New Folder.exe

Bha.vbs

Iexplore.vbs

Info.exe

New_Folder.exe

Ravmon.exe

RVHost.exe

Any other unknown exe file

If you notice any of the files above, type attrib -h -r -s -a . and press Enter.

Now delete each of the above files by typing the following command: del "filename" (for instance, del autorun.inf).

That’s all there is to it! Now just scan your USB drive with the anti-virus software you have to ensure that your pen drive is really free of all viruses.

(Compiled from various internet sites)