So I decided to shut my computer down last night, And turn it back on this morning. But for some reason, the computer is going really slowly whenever I use a web browser to go on the internet, like it loads pages really slowly. My computer is also randomly making the noise when it overheats, like it is doing something other then using a web browser. My computer never overheats when I use a web browser, only when I play games like WoW or Minecraft. Also, it is making little ticking noises, like it does when I am downloading or installing something. I think it might me doing something in the background that I don't know about, or maybe it's a virus. Can someone help me out?