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I downloaded Heroes 5, installed it, and then realized I needed to download a patch from another source and install that as well. I did everything. I play, and then when I exit the game and go back to Windows, I can't log back in; it says the game is not responding. After a restart, it works again. What's the problem, and how can I fix it? I'm using Windows 7 Ultimate, 3GB of RAM, and an 8400 GeForce video card.