No Longer getting good fps?

[ReconMalfunction]

I got my pc on Christmas, and when I first played on it, it had amazing fps. Battlefield 4 was 80-100 FPS, DayZ was 50-75 wherever I went, and so on and so fourth. But recently they've dropped, DayZ is 40-50 when I'm not in fields, 20-35 when in cities, Battlefield varies from 30 to around 61.

GTX 650 Ti Boost
Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz 4.20GHz
32GB Ram
64 bit Operating System, x64-based processor

 

[DonnyTechMaster]

Have you run any virus scanners? If you have any virus' on your computer, then they could be slowing your pc down by running in the background.