Any game I play is slow

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Brendan - Updated by Brendan on 5/02/17 at 10:39 AM
So i factory reset my computer a while ago. Completely wiped it. And now when I started it up i realized it basically got rid of everything I need to do anything. My question is, what all do i need to play any game. This is a decent computer and it wont even run something like agar.io without being lag spiky. What do I need program wise.