Reply to help please

I cant get my software/s4 to stop popping ive tried everything
I have a hp pc with i5 processor 2.5 running windows 8 64bit
I run traktor with an s4 and 2 1200
8g ram
I have tried adjusting the latency settings every way possible
and I tried to optimize my comps setting to the best of my knowledge (which is limited )
it never fails it pops and hisses every 20 min or so it doesn't seem to be a load issue
I don't please help