Really? Did you go to AMD's website, then properly select the drop boxes to get the driver package? It should still run, but at reduced performance. In addition, artifacting in Skyrim occurs if you have the 12.2 drivers, make sure to use 12.1. Know how, or need instructions?
i download the amd's auto detect and install, when it started to installing the update it keep telling me this message
"amd catalyst mobility cannot be downloaded due to incompatible hardware/software. the version of graphic is not supported, please contact your manufacturer"