At least a couple of times a year, get the inside of your PC case cleaned out. Whether you do it yourself or bring it to someone like myself who is almost certainly more experienced at this less than glamorous sort of task. Why? Setting aside the gross factor, the real reason is heat. Dust and dirt build up, and serve (quite well) as a blanket over your PC's inner workings. Ultimately air fails to circulate, heat accumulates, and components begin to fail. Does this sound like a series of "good things"? Since a picture is worth a thousand words, here are a few pictures of what you DON'T want the inside of your PC to look like: