PC became slow (suddenly) and a major drop in performance

[aca85]

Computer Type: Desktop
GPU: Asus gtx1060OC 3GB [not overclocked]
CPU: Intel i5-4460 [not overclocked] + stock cooler
Motherboard: GIGABYTE Z97X-SLI-CF
RAM: Kingston HyperX DDR3 @ 1867 [not overclocked]
CASE: Cooler Master Silencio
SDD: 2x Kingston SV300 (one for OS other for Games)
PSU: ThermaleTake SmartSE 530W
Operating System & Version: Microsoft Windows 10 Professional (x64) Build 15063.674 (RS2)
GPU Drivers: 385

Description of Problem: My pc became slow suddenly, max fps i can get in games is 20fps, most of the time is less. Even animations in windows and 3rd party apps lags. Idle temp of CPU is 50C [might need new paste] I have detected that my GPU when idle has a temp of 80-82C , GPU Core load is 100% and GPU memory usage is 45%.

Troubleshooting: I have reinstalled Windows on other SDD, i have physically cleaned components and case (vacuumed and blown-out [with air compressor]), checked the memory with Win MemoryTest [no errors], i have checked all HDDS and both SDDs for errors and defragmented them, i shut down some services and processes (like xbox and similar), also tried unistalling all nvidia drivers from my system (physical files and registry) and installing some older one 385.xx and it's still the same.

Update: HW monitor screenshots https://imgur.com/a/mgEdz

 

[superninja12]

Hey man can you screenshot temperatures from hwmonitor?

 

[aca85]

Hey man can you screenshot temperatures from hwmonitor?

Yeah here you go

https://imgur.com/a/mgEdz

 

[TMTOWTSAC]

Have you run an antivirus scan lately? If a background miner snuck onto your machine it would explain 50% CPU load and 100% GPU load at idle. Does it exhibit the same behavior if you boot into safe mode?

 

[Bruno Vincent]

As long as I know you are not supposed to defrag ssds...but appart from that since you reformatted?...wait for a pro to answer!

 

[aca85]

Solved: i had two hiden bitcoin miners deeply embeded in my services, took me a long time to find them, no antivirus / spyware found them but that was the only logical solution (suggested to me by one of my friedns).
What i did: tried to remember exact date problems started, then in %appdata% found any/all files/folders modified and going one by one eliminating real files from fake.
Tips: Don't bother doing this, just save you personal data and completely wipe your sdd/hdd ,as there miners are self replicating, like a real virus.