On my new job at COMTECH, aside from teaching they put me on the computer laboratory as their maintenance. Lab is installed with Windows XP Home edition and other software but i will be migrating some computer to Edubuntu sooner or later. For the meantime I've tweak some on the registry of Windows Enable/Disable the USB port just to control student from inserting the memory stick:

On the registry:
Click HKEY_LOCAL_MACHINE > SYSTEM > CurrentContolSet > Services > USBSTOR

Choose the Start Modify the value data 3 to 4 Hexadecimal

3= Enable
4= Disable