I'd be surprised that DOSBox is related to that. I'd rather check first if your computer is not overheating if I was you. DOSBox take a lot of ressources from the computer, and it could be a very good reason why the temperature rise faster.
First thing first: open your case (make certain you are grounded so you don't discharge electricity on a component) and clean the computer from dust (you should be, like everyone else, surprised on how much dust a tower can gather with time). Safest way to do that is to have a soft air outake (they sell presurised air cans made especialy for that, but they are very costly when you consider that you are basiclly buying air in a bottle). Then make sure that all the fans are working when you turn the power on, especially the fan for your power supply.
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