Why is my computer slow?

Hetza

Prominent
Apr 4, 2017
6
0
510
My computer is what i would call very beefy it is running a I7 7700k overclocked to 4.6ghz and 16gb ram and a Gtx 1080 gigabyte g1 gaming. However i was usually playing games such as arma 3 at around 70-130 fps on ultra but after i turned my pc off and came back to it a day later it was only running at 30-40 fps no matter what graphical setting i chose. I have run every type of nortan scan and avg scan there is and all came up with nothing. Is there anything else i can do to fix it.