Disable USB port

1. Goto run 
2. Type'regedit'without quotes
 3. Click on HKEY_LOCAL_MACH INE 
4. goto SYSTEM
 5. Click on CurrentControlS et
 6. Click on services
 7. Goto USBSTOR
 8. Double click on'Start'where value is 3
 9. Now change the value data with 4 
 10. Now press ok and refresh your desktop your USB port is disabled, to enable the usb port replace the value 4 with 3. Have fun guys...