About a week ago my pc started making a random clicking sound. It sounds exactly like pressing the back button or home on IE. Even when all of the programs are closed (except for my antivirus and such). It usually happens within a 5-10 minute interval, and is pissing me of to the max because i can't watch a movie normally or play a game. Any suggestions what this could be, or how i can get rid of it?I ran my antivirus but it doesnt find anything. What should i do?