"I understand the whole installing a driver with compatibility mode but that seem quite impossible if the system does not even find the devices?"
Does that mean you have tried it? It should not be neccessary to find the devices, in order to install the drivers.
Just in case, right click the setup.exe for the driver (atheros?) and under the compatibility mode select Vista RTM. Also select run in Admin mode. It is rare that the Vista drivers do not work for 7.