Try reseting your video card options (if you have changed them in the past) as well as updating your driver (which I am guessing you already have done).
I am not getting any of the problems you speak off and I been using MoI a lot lately trying to finish this project. I am runing on Windows XP SP2 with an Intel R Extreme Graphics Card Chipset (Integrated crappy) has 32MB of memory.
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