Gaming PC running slowly

[jackstack10]

Specs: GTx 670
8GB 1600 RAM
I5 2500k
asrock extreme 3 gen 3.
This build is running blacklight retribution at 20 fps and tf2 stutters on max settings, i have only noticed this slowdown in the past week. I have defragged and ran ccleaner. Drivers are all up to date. any help? Im disappointed that i spent 1000$ on a gaming pc and its not running well. :/

 

[mocchan]

What kind of temperatures are you seeing on your GTX670? Same goes with your CPU.

If one of them is overheating, they will significantly reduce their performance to prevent burning out.