I cannot exit game and it freezes up my who...

I cannot exit game and it freezes up my whole computer and I have to shut all off. I tried exchanging game and new one does the same thing, I also tried your patch.. I cannot return. I have a new emachine computer I bought in January. All I do are games. I might as well send back to you for your game is of no use to me. I have many of your games I have not tried to load any others. If you could help it would be great. Thanks for your time.