Fan noise and low fps in game

Hi,

I have this problem for over a month... my laptop randomly starts Windows Media Player after like 1 minute I open it and my fan starts to make this loud noise like an airplane... Thats not the only problem, I also got low fps in games, at least League of Legends, it drops to 20 fps.. I didn't do anything.. from one day it just started acting like this for no reason... I opened it, it's nothing related to hardware.. I seriously don't have any idea. Can you help me?