It is easy to lock a machine down, disable the floppy, and cdrom in the bios. Many times when you try to disable USB - it disables it entirely.
This can be a real pain on newer laptops or systems that don't even have a PS2 interface for the mouse or keyboard.
There is a simple registry change that will keep the USB storage drivers from starting when the system boots. Keeps people from walking up to a PC and copying data off with a USB key, but allows you to keep your scanner, keyboard, and mouse working.
As always - back your system up before messing around in the registry.
Just open regedit (or go to Run => 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.
You are done. Plug the USB and access USB drive now..
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