Generic USB driver downloads limited to keyboard and mouse

Hi Guys,

I'm new to this forum.

Ok so i have been asked to make a unit (Touchscreen all in one unit) only accept the input of a keyboard and mouse, we are using windows 7 on the machine.
Before we had issues where our customers customers removing the mouse and keyboard and put there own devices in, such as flash drives, phone cables and suprisingly enough keyloggers.

So our customers requested that no other device to work in the usb ports but our USB keyboard and mouse, i have a feeling that keyloggers will still function even after this is done, well if this is even possible.

Any help will be appreciated.

Thank you