I have been having problems with my computer for around the last 2 weeks now. the issue is that out of no where it just started to get slow i have never had these problems before i have done a complete windows 7 reinstall but that still didn't work. I also ran the fur benchmark thinking that it may be it and read that if u see black squares or something like that it means that ur graphic card is broken but i saw none of those but i didn't have it on for long because my graphic card was getting over 60 and it started to worry me im not really experienced with that kind of stuff . i also ran all kinds of tests thinking that it could be my HDD i ram the chkdsk command, disk cleanup, error checking, and even software but they sat that everything is fine with them. i do not believe that its a virus or anything either because i have done all kinds of scans with avast and malwarebytes (Both Pro) and they have found nothing. i tried cupid hw monitor but all my temperatures seem fine and normal my fans arent clotted with dust especially now i just finished cleaning all the fans and at this point im at my witts end on what it could be and i need your help.
System Specs:
i7 4770K 3.50ghz ( oc genie) 3.9ghz
Nvidia GTX 980 Classified
Gskill 16Gb Ripjaws ram DDR-3
Msi z87-g45
Corsair RM 850
old ps4 factory HDD from Samsung 500 GB ( OS installed on here )
WD 1tb ( all games and such )