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The usual issue is either an incomplete install of Windows, heat, drivers or a game bug.
So lately (ever since I installed Assassin's Creed 3 and Aliens vs Preadator) my computer during any form of gaming has been freezing with the sound continuing. It becomes completely unresponsive and results to a manual power off. One thing I have noticed is that sometimes skype will continue to run and I can stay in conversation with someone whilst it is frozen but sometimes it will not.