The pen drive virus is a type of Trojan horse that infects a computer via a "pen," flash or other removable drive. These Trojans typically create multiple files on the infected hard drive that are stored within legitimate files and folder names. In addition, files will begin to randomly appear and disappear for no apparent reason. The following steps will assist in the detection, removal and prevention of the pen drive virus.


Insert your pen drive into one of the available USB outlets on your computer. If a program dialog box displays, select "cancel." Do not double-click on the drive icon to open the drive.

Double-click on the "My Computer" icon on the desktop. Select "Tools," "Folder Options" and "View" from the menu bar. Make sure that the radio button next to "Show hidden files and folders" is selected. Uncheck the box next to "Hide extensions for known files." Uncheck the box for "Hide protected operating system files (Recommended)." If a warning message displays, click "OK." Click "Apply" and "OK" to save all changes.

Verify the drive letter that represents your USB or pen drive. For example, if the drive displays as Kingston (M:), the drive letter would be "M".

Click on "Start," "Run"; type "cmd" and press "Enter" to open the command prompt window.

Type the drive letter, for example, "M" followed by a colon (":"), and press "Enter" at the command prompt to open the root directory of the drive.

Type "dir/w/o/a/p" and press "Enter" to display a list of files and folders present on the flash drive.

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