After reinstalling the graphics card, the game runs for about 45 minutes so far, seems to be working. Thanks!
However, the 60 fps mod doesn't seem to be running right? I manage to get 40-50 fps. Depending on the area and visibility and such. However, there are always noticeable slow downs even though it continues to show over 30 fps. In addition, the characters sometimes run in circles in cutscenes and don't seem to find their positions properly. I guess there's nothing you can do about that?
Thanks again!