Hello, I have had this issue with my PC for quite some time and I've run various scans to try to fix my issue but it was all to no avail. For a while, I noticed the performance on my PC was not up to par but I never realized that it might've been virus/malware related. After opening task manager, I see that for the first couple seconds of it being open, my cpu usage is at 100% and then it swiftly dips down to 5-15% chance without actually showing an app that is using that much of my CPU. I have even reinstalled Windows and the problem still persists while I have minimal programs on my PC installed such as Firefox, Discord, Epic Games Launcher, Spotify, and Steam, as well as some virus/malware removers that I have downloaded in an attempt to fix this problem. I've been told that reinstalling Windows fixes the issue every time yet I can't seem to get rid of mine. All evidence points to the fact that it should be a bitcoin miner virus but if I reinstalled Windows and have ran several malware scans, what could the issue really be? Any help is appreciated, thank you for your time. FYI, when I boot into Safe Mode, my CPU usage is not at 100% but rather roams around 26% with 13% going to Windows Explorer and 13% going to Services and Controller app. The attached files below are from separate times where it shows no programs using high CPU usage and one of them showing "System interrupts" taking up 90%.