New
#11
You said you downloaded and saved the drivers from the Asus site but did you ever install them?
What extensions do the driver files you downloaded have? If .zip then you need to unzip them, if .exe you need to run them which may unpack them (but might also install them). Once you have the drivers in a folder on your drive then go into Device Manager, find your Broadcom device, select install driver for this device and tell it to search in a specific location then point it to the folder where you have the drivers. It should then be able to install the driver then.
In regards to what you posted above about using the Win 8 drivers, I am doubtful they will work.