When I leave a city and go walking around or when I enter a dungeon or quest zone my game starts to lag a little bit then it freezes. my screen goes blue and gives me an error message before restarting my computer. The error message says: BAD_POOL_HEADER and technical support information and *** STOP: 0x00000019 (0x00000020, 0x89DE0D98, 0x89DE0ED8, 0x0A280001) It works fine on any other computer and i have no idea whats wrong, someone help please.