Windows 10 Fixing Taskhostw.exe High CPU Usage Issues on a Gaming PC

Specs:

• i7 8700k
• GTX 1080
• 32GB DDR4 RAM

Details:
A couple of weeks back I noticed my PC slowing down, lots of lag whilst editing in Premiere Pro and games became unplayable, giving me less than 50 frames, I don't have a fps monitor but I'd say near to 10-20 fps.

I did a bit of digging and found what I thought was the cause, Taskhostw.exe, which using Run > 'perfmon /report' was giving me a warning that this was using 99.8% CPU. Whilst the task monitor said otherwise (overall use was at about 10% CPU)

I tried a standard reset and the games and editing was still slow. So eventually went through some malware removal processes, no luck, after fresh install but stilll no luck. I gave it to a repair shop and they said they'd fixed it, but here I am still with this issue however, so far Premiere Pro and games seem to run fine whilst it's still flagging in Performance Monitor.

Steps taken (In Order):

1. Run Rkill
2. Run Malware Bytes (Rootkit scan)
3. Run ADWCleaner
4. Run HitmanPro
5. Format all HDDs and reinstall windows
6. Repeat of step 5
7. Take to shop where they once again wiped everything and reinstalled (Don't know if they did anything else - will follow up)

Any ideas, is this just something false being flagged by Performance Monitor?

PS. I've talked to a couple of friends - 3/5 have the same taskhostw.exe error in performance monitor.