To check if it's your saved game, load an older saved game and see if it CTDs in the same location or not. i checked the old save and i play with no CTDs
i was playing on whiterun with no proplem and my CPU Quad RAM 4g I think its because the savegame get crached this is my savegame can you try it http://www.mediafire.com/?vepdlcw7y8e6bw0