Drivers not compatable

I put a Radeon hd 7850 in my system today and a new hard drive and windows 7 64-bit OEM.

I lag so much when playing games and I literally get .5 - 2 fps in solitare. I narrowed it down to a driver incompatablity, because when I boot Windows 7 after installing my drivers for my GPU, it takes like 30 minutes to boot windows, and I know that usually happens when drivers are incompatable. So can anyone tell me which drivers might be conflicting.

MOBO: ASrock 970 extreme3 ------> Extreme3

GPU: AMD Radeon hd 7850 ------>
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More about drivers compatable
  1. Update windows .Automatically detect and install latest best driver and fix all issues.
    Update bios.
    Update hdd/ssd firmware.
    Full Scan system with "SUPERANTISPYWARE" Freeware.
  2. Gpu set up look like this. 1x gpu=x16; 2x gpu=x16+x16=(x32); 3x gpu=x16+x8+x8=(x32); 4x gpu=x16+x8+x4+x4=(x32). so 2xgpu=4xgpu.
    Check the gpu is in x16slot otherwise u dont get full speed.
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