Pointer Seizures, System Freeze-ups

Posted this to software and got advice that it's likely a well-hidden rootkit. Ran the recommended scans and they found something, so that probably explains at least part of it. Seeking further guidance.

Two unrelated issues. Have had intermittent freeze-ups for a long time, but none between January and November 2017, so I thought they were gone. Recurred shortly after running last set of Windows updates. Ran Tweaking and Chkdsk-R last week to get at the freezes. Had another freeze-up on Dec. 9. On Dec. 12, began seeing weird Pointer stutter. Happens when I’m using the PC doing a wide range of activities. It happens when the PC is idle. Sometimes the pointer jumps randomly and selects icons on the desktop or clicks on menus or other items within a program, including Firefox, Chrome, Cortana, Word, Excel, Civ VI, Task Manager, etc. After a while the problem seems to disappear, only to come back later. Increasingly it’s been going into seizures in which the pointer stutters uncontrollably at the top of the screen and can no longer be manipulated, while the current window shakes violently until the seizure subsides, usually in about 30 seconds. The problem still occurs in safe mode or with a clean boot. Occurs with our without touchpad activated and with or without my external wireless mouse plugged in. I've checked mouse and touchpad drivers with both the built-in check and Driver Booster 5 and they (and everything else) appear to be up to date. Tried external Mouse on a different PC and no problem. Tried a different external Mouse on this PC, and the problem occurred again. Had it happen once during a restart, before I had even logged in. Seizures happen whether or not anyone else is using a wireless mouse in the house, as they have been simultaneously at most times since I acquired this computer in 2016. Occurs whether or not the router is plugged in and whether or not I’m connected to the Internet.

System is a Dell Inspiron 17-7778 laptop with an I7-6500U Core. Purchased in Sept. 2016 and have been using it steadily since then. It came with Windows 10 and is currently running 10.0.16299.

About the old problem, the freezes: Within a few weeks of purchase, the system occasionally froze, often accompanied by a loud audio buzz. During a freeze, the keyboard and mouse are unresponsive and the only option is to use the power button to reboot. Sometimes the PC fails to reboot at first, but nearly always works on the second attempt. I initially found the problem only with high-graphics game software and thought it was some type of compatibility or settings issue, but then had freezes when I was running only Word if Firefox a few times and they began to come more frequently starting about a year ago. In January 2017, I ran DriverBooster on the system and it found a large number of outdated drivers, which I updated. After this, I did not have another freeze until mid-November 2017, shortly after installing a major Windows update.

Files requested by MajorGeeks attached.

 

This is the only account I've ever used on this PC. Sorry about not including the ADWCleaner log. Attached here.
Are the items that came up during the RogueKiller and HitManPro scans not Malware then?

 

Thanks! Good to rule out MalWare at least.