I have an AMD Athlon X4 750K 3.4ghz quad core, my pc is always loud, and after playing some games it starts smelling like burning plastic. When i turn it on, it varies from 75-85 degrees celsius, after turning on internet, it varies from 85-95 degrees celsius, as of writing this with only 2 tabs open on Mozilla Firefox, it is on 91 degrees celsius. What do i need to do? I am going to clean it up today but i wanna get some advice first. I bought it pre built and i'm not hardware-savvy.