pc running slow

[NaziZombiesYay]

so one day i got a mallware and i reinstalled my windows and before i reinstalled my win cs go was running with 30 - 40 fps on lowest setings plus with a config and now the max i get is 20 i tried cleaning my pc of dust cuz my gpu was 75 C Help

 

[JohnBonhamsGhost]

have you reinstalled GPU and motherboard drivers?
also check power settings. Power Saver plan will hinder performance. set to High Performance or create your own high performance plan.