Q: F keys don't work with Windows 10?

Recently upgraded to Windows 10 on my 2012 Macbook Pro Retina, and now the F keys don't work. As in I can use F1 for help and F5 for refresh but can't use them to change the screen brightness or such (even with the fn key). I've tried redownloading the drivers from bootcamp assistant but when I try installing I get the message that "This app can't run on this PC". Any help would be awesome! Thanks