I've recently bought a Toshiba satellite R845-S85,, I have formatted and installed windows 7 ultimate..
The problem is with the drivers ,, I really have a hard time finding and choosing the drivers ! Plus not Fn keys does work.. like the wireless and the brightness.. but some like mute key and sleep mode does work..
I'd be very happy if someone could list me the drivers names for this specific laptop and tell me the solution for the FN key
Your drivers are available here. In the future, it's best not to perform a clean Windows installation. You should have performed an upgrade, which would have been a much simpler process for you as well.