For an Aurora R1, you can either disable the Dell 365 BlueTooth Module from:

1. Device Manager (where varies, depending on Windows 7, 8 ). I couldn't get it to work under Win-10 and so I disconnected mine too.

2. Inside PC, disconnect BT module from MIO-Board. 

Edit: On my Aurora, it's a 1 inch circuit board held inside the front case with a black knob.

The Aurora-R1 Service Manual page 100 discusses the removal of the Bluetooth Module.