This sounds suspiciously like the nVidia driver problem. What kind of video card do you have?
Edit-> Almost forgot, welcome to the .Org!
Edit2-> Going offline for the weekend, but if you do have an nVidia video card, try to change your anti-aliasing settings. See posts #7 or 11 from this thread:
https://forums.totalwar.org/vb/showthread.php?t=64977
Northnovas found this solution for nVidia's newer drivers. He suggests setting AAx2, some have set it to AAx4 and had success.
Good luck!
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