100 disc use windows 8.1

[mustaphab]

I have had windows 8.1 for quite some time now and never had any issues with my OS. Until recently, my OS disc use now shows 100% with writing speeds going up to 100mb/sec and average response times of my HD from 4000 to 8000ms...

Nothing has changed on my side and I have it at a repair shop right now. They said hardware is 100% fine and they are running a stress test on my PC but everything looks good so far. ANy ideas?

 

[Dark Lord of Tech]

Virus , software running in the background , too many programs running at startup.