Why does my computer freeze when i play total war shogun 2

Evans1234

Distinguished
Dec 22, 2011
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As the title says I am having trouble with Shogun 2 total war. The game just freezes the PC, the music cuts out and everything except the mouse does not work, i have to ctrl+alt+del every time and open up task manager to cancel it. This happens randomly sometimes in a battle some times on the campaign map and sometimes between turns. I have also had problems with my display driver where my screen goes black and then comes back on again saying display driver not responding but was recovered.
My PC spec is:
Intel i5-2500k @ 3.5GHz (max temp reached: 60C)
Gigabyte Z68X-UD5-B3
Palit Geforce GTX460 1GB (40C)
4GB DDR3 RAM

Can anyone give me any ideas on what is wrong???
I have seen another post on this where they said it may be the card but i just want to be sure before i go out buying a new card.