Bootcamp driver updates on iMac for gaming

I am running bootcamp on my iMac and attempting to play Battlefield 4. I can run the game, but every time I open it I get a message that says please update my driver to 13.9 or later (I am running 12.8). I have a HD67000 Radeon series. I go to AMD.com to update my drivers. The latest stable driver that is out is 13.9. I download it, it open Catalyst Control Center, I click install, it fails every time. I have tried everything to get it to install but it will not. There is also a beta 13.9 driver available so I tried that one as well, also will not install properly. I downloaded the older 12.9 beta driver and installed it and it worked properly, so it seems I can not install the most updated drivers. I am playing with my graphics on low to medium in BF4 but I know the updated driver would fix my problems. Any tips on how to get the latest drivers for Bootcamp Windows 7 64-bit?