Can't play any game smoothly anymore

[admin89]

Then nothing we can do
Your current PC is weaker than the Wii/GC console, no way it can run any game at playable speed
The cheapest method right now is to buy a graphic card and plug it in your computer , as your PC doesn't have any
Something like GTX 750 or GTX 1050 doesn't require much power and these GPUs should work fine on any power supply (as long as it's not under 200W)