whenever I open task manager, the cpu usage is at 100%, but then it drops down to a few percent (less than 10 while idle). my other computer did this, but in that case, it remained at 100% or near it. is this a bug with windows 10 or one of its updates? I tried disabling all apps I could find in task manager. next thing, I'll try is safe mode. I don't recall it doing this originally unless it was right after boot.