Today, when was playing tf2 it started lagging like mad ; it continued to do this throughout the time I was playing. After the game I felt the computer and it was very very hot. So I’m convinced the computer was overheating due to the fan not working properly. I want to try cleaning the fan but how would I go about this, I don't want to open up the computer because this would cancel my warranty. Could I use a vacuum cleaner or something to suck out any dust on the fan ?