CS:GO for example runs normally, but when I'm on desktop or playing i.e. Modern Warfare the disk usage and CPU spike to 100% every minute, and the GPU is at only 10% usage for some reason but I have 100FPS in game. When the disk usage jumps to 100%, everything completely lags out, game completely freezes for a few seconds, then after that it starts to stutter, after that it becomes normal again. It happens every minute or so but only in some games and when surfing the web or leaving the PC idle on desktop. Also, when I'm stressing the GPU it stays at 2-3% usage??? All other games have become laggy too, except for CSGO which runs completely fine and when I play it, the GPU usage is OK, around 30%, just like it used to be before. Maybe you know the fix for this. I have a feeling that the last Windows update ruined everything.
Here is a screenshot when that disk spike happens (disk usage goes UP, CPU usage goes DOWN):