How to disable com(?) connection for HID device ?

I've programmed my atmega32u4 pro micro board to be a HID keyboard encoder in a gaming control panel. I want to be able to give it to someone and when they plug it into their XP machine it shows up as a HID. At the moment it shows up as a HID but also as an unknown device, triggering pop up windows etc.

As far as I understand it the unknown device is the bootloader trying to connect as a com device?? So I guess I need to turn off or remove the bootloader?

It doesn't matter if that makes it harder or even impossible to re-program the board.

thanks