Hmm, i would disable advanced features in Catalyst control center, like Catalyst AI. What is your Catalyst driver version? Also try setting graphics in the game settings to minimum, disable high landscape and sky detail. If it works, you can increase graphics step by step later.
Also try running the game executable manually as administrator by right-clicking on it and selecting 'Run as Administrator' from the context menu. Steam should do this for you, but i would try just in case.
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