Have you at one time or the other used your flash drive in someone else computer and try to use it on your own computer and you discover that when you click on your drive to open, it opens in a new window?
Do you always see a notepad file with the name BOOTEX.LOG inside your flash drive?
This is a sign that you have autorun virus in your flash drive. Autorun virus is transferred through flash and storage disk from an infected computer to a none infected one. When an infected flash drive is inserted into a none infected computer the virus uses autorun.inf to execute the virus on the system. The virus is always resident in the root directory of the flash drive and other storage devices. It has file extensions like .bat, .exe, .com, .BKK and file name like autorun.inf, o1.com, etc.