hmmm. that happens to my friend on his computer when he exits the game and tries to open it too fast. like how long untill you try to open it again? if its like with in a minute depending on your computer speed, just waiting is the best but if its like a few minutes or longer i really dont know what to tell you other than to unistall and install again. I just delete and start over again almost everytime I have a problem with CA and it fixes it most of the time.