Apps will help you to enable and disable USB port.
...You can use it for security purpose if you don't want anybody to transfer data from your computer you can disable USB port.
For details and usage you can visit the page
http://blog.sthpratik.com/2012/12/making-usb-controller-using-delphi.html
Goals:
Be quick & simple
Be Clean
Run on removable media
Integrate w/ other software
Idea:
To have a simple screen-saver on/off switch. Two components, front-end UI & portable back-end.