Yes vss, what are you doing but showing the point? You can't just plug a USB device into a computer and expect black magic root access to the host.
For your device to function in it's multipurpose roll software has to be MANUALLY installed on the host.
I'm telling you, that it's possible to create a multiporpouse usb, don't needing drivers but using the window's ones, such has a usbflashdrive and a keyboard.
When you connect a usb, the usb tells the OS which drivers to load.
Example
Phase 1 connect the device
Phase 2 tell the OS it's a "Mouse Type"
Phase 3 tell the OS to load
+ keyboard drivers
+ hard drive drivers
Phase 4
+ When pressing a button, Copy data from the device to the computer
Phase 5
Profit !
Read further up vss.. It DOES NOT WORK THAT WAY. The USB device does not tell the host what drivers to install, nor can it supply them directly. It supplies a device descriptor and some other information which the systme can load generic drivers for, People far smarter than any of us have tried this already, unless you can find a specific device driver on a specific OS that your device will load that has drivers that can be tweaked for root access...
[FONT="]1. [/FONT][FONT="]Add a user account to the system or the domain.[/FONT]
[FONT="]2. [/FONT][FONT="]Run a program that sets up a backdoor.[/FONT]