I've format my pc..then what?

Ever wonder what to do after formatting your PC? Yeah, i'm talking AFTER formatting here..not how to format PC :P. But if you need or want to know bout that, don't be shy..ask me how and I'll tell you of course!

Ok,back to our topic.
Here i'll list the most basic software you need after formatting.
Don't worry bout the fee coz my list contain ONLY free software or open source coz i'm one of the people that hate to spend money while we can get it free. Am i right? >.>