After the 17.12 "Adrenalin" series drivers broke older DirectX 9 games like The Witcher or C&C3 and community management responses were a bit brief, the issue has been found and an upcoming driver release should fix the problem. If you cannot wait, here's an alpha release of 18.1.1 that fixes just that issue: http://support.amd.com/en-us/kb-articles/Pages/RSAE-18.1.1-Alpha-Release-Notes.aspx