HELP: My computer is overheating & shutting off.

[Clipped]

My computer is overheating & shutting off. But only when I try to burn something or play video games. Does anyone know what I can do?... Keep in mind I don't know a whole lot about computers (I'm not exactly a novice, but I'm not advanced either)

 

[iam_not_2fast4u]

wrong forum

 

[The General]

And now double posted instead of moved.
http://techist.com/showthread.php?postid=900145#post900145