I totally understand what your going through, I had this problem a few weeks ago. Try cutting down the number of mods and expand your virtual memory or so if your PC is over 5 years like my one, try Game Booster v1.6 as suggested to me by Damo which will help to free up memory and it's free. I think it dose help but don't d/l v2.0 stick to v1.6 as said.
http://bstdownload.com/appdownload/game-booster-1/
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