USB – порты можно отключить руками.
Just open regedit and browse to this key:
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services UsbStor
Notice the value 'Start'
Switch this value to 4, and USB storage devices are disabled.
Switch this value to 3, and USB storage devices are enabled.
Но можно и простой утилитой:


http://community.livejournal.com/flash_pc/50563.html