Windows 10 CPU usage showing 100%, RealTemp only showing ~15%

Okay so this is the second time I have come across this issue. The first time I ran deep virus and malware scans to no avail, ran CCleaner and updated all drivers as well as checking startup items and finding nothing unusual. I ended off having to re-install windows and this fixed this issue for a couple of months but its now returned and I have no idea whats causing it, it slows my PC down horribly making gaming and general use basically impossible.

I have tried updating drivers, virus and malware scans as well as running advanced systemcare again with no result. It goes without saying that the random usage doesn't add up on task manager, everything at idle will add up to about 15% which is what realtemp reports however displays 100% usage at the top. Its also worth noting that the temps get no higher than 35 degrees celcius.

My current build:
i5-6500
Gigabyte RX480 Gaming 4G
16GB DDR4 Corsair Vengeance LED 2666MHz
Gigabyte H110M-S2H

If this is posted in the wrong forum I really do apologize, I couldn't quite find one it fit into any better than this.

Thanks in advance for any help.

I downloaded it and I can't see anything taking up the apparent 90-100% load, there are things using no more than 10% and cumulatively use no more than 20% however. I tried the virus check and ended all tasks that were flagged despite the fact that they're trusted well known pieces of software, this didn't help either.

Any other ideas? Or am I just going to have to reinstall windows again?

Yeah I agree, I started it in safe mode, one of the first things I did to see if it was affected by the problem here but nope, it was running perfect, I'm currently using sfc /scannow and LatencyMon to identify the problem, as of now nothing but I'll keep you posted.