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#11
I would remove the AMD driver suite from this PC via the normal route (Add/Remove Programs), then reboot the PC.
Run CCleaner (freeware) for the being sure the Catalyst drivers are gone (used for Nvidia driver clean wipes too), reboot again.
Install the Catalyst suite again, Express mode is likely fine, the latest stable one, see where you are at then after one more reboot. 8)
If that fails to be the improver, I'd uninstall Direct-X, reboot, reinstall...