I’m running windows 7 and had uncontrolled scrolling, crashes, curser jumping, slow downloads, couldn’t insert without tweaking over and over and other issues. Spent weeks going thru everything possible to correct these. Finally did a Norton Eraser, which goes deep into the computer, in hopes that would at least identify. Ended up it was ‘Defender-Pro’ program which buries itself into your registry and reconstitutes itself even after you uninstall. Norton Eraser named it as bad and removed it.....all issues stopped then.
Thank God, but you mean that program did not show up in your list of running programs? The well-tested free Process Explorer and AutoRuns can help with that. Plus Win Patrol o alert the user to secret additions to the start up folder, etc.