You need to completely remove any and all AMD drivers, then reinstall the 12.8 drivers. If you need to reinstall Windows, then do it. Or run one of the many driver cleaner programs.
This problem is ALWAYS the wrong driver version - cgminer craps out because the SDK is wrong, so it can't build the kernel.
This.
AMD has it's own driver cleanup tool too, wich works like a charm.
When there's junk left from older drivers, they interfere with the newer ones and will cause BSOD's.
Catalyst Uninstall Utility:
http://sites.amd.com/us/game/downloads/Pages/catalyst-uninstall-utility.aspxAfter uninstall, reboot and install new drivers.