Mice and Pointing Devices

[reddevill7nine]

I have noticed that when i plug-in my nano reciever for my m570 on a windows 7 machine, windows detects several devices (5 or 6) that need to be installed. after all the devices are installed, going to the system summary screen in windows (right-click on computer, select properties or click on start, type system and under the control panel section, click system), windows reports that something is reserving 100mb of ram:

Installed memory (RAM): 8.00 GB (7.90 usable)

What is going on with the mouse hardware that would require this. Is it possible to remove the hardware. This is in important question for many reasons, one such being that i connected the mouse to some friends computers to help troubleshoot and now, upon unplugging the nano reciever, the memory is still reserved.