I recently purchased the batman arkham games during the steam sale. As soon as I started playing Arkham Asylum my computer got really hot and shut down after about 45 minutes of gameplay. I was able to turn it back on after about five minutes and no other activity(other games, movies) causes it to overheat but when I tried playing the game again it once again got too hot and shut down after about 45 minutes. I have never had issues with over heating before. I have a Toshiba Satellite S955-S5373.
Any help with what might be causing this would be greatly appreciated.