Just a tip in case you are having the problems I did. I was getting winter texture not available, after battle crashes, and other random crashes at first. At times my game would lock up and the old save would refuse to reload. I have a geforce 470 video card on Win7. I lowered the resolution from 1900x 1200 to 1440x900 and voila all this has disapeared.
I am sure the problem is driver related but I mention it in case someone else has the same problem, and the fix was simple.