Any one is stealing is your files through the pendrive which has been made by you by doing very hard work..........then to block them here is the simple method...........
Follow these simple steps....
* Click Start and click on Run and type Regedit,...Hit Enter
* In the registry menu Locate and then click the following registry key:
* In the right hand panel double-click Start as shown in the image below.
* In the Value data box, type 4 and then click OK.
* Quit Registry Editor and refresh your desktop.
U can re-enable pen drive detection by changing the value to 3