"Documents" folder opens twice automatically after a reboot

[Sabmoog]

Hopefully someone has some idea as to how to stop this behavior. 

After I start my PC, the documents folder will open itself, and take focus after a couple of minutes. 

A few minutes later it opens again automatically. 

This is really frustrating when in a full screen game, as it minimizes the game and opens "Documents."

I searched online and tried a registry value fix (sorry, I do not remember exactly what I looked for, but the recommended key was correct in my system.)

I have also looked for viruses with 3 free malware/AV applications. 

 

[Murasaki]

I always recommend Autoruns to list all possible entries for startup programs. It will be much easier to find anything suspicious with your own eyes. It also has options to hide Microsoft verified files and offers VirusTotal scans to narrow down your search. ( This is not an ad btw i sound like a salesman )

[Sabmoog]

I used the application suggested, and it's pretty cool.  I disabled some unknown programs, and some others that I don't need to auto start, but the behavior still persists. 

Unfortunately, I am not really sure what I am looking for in the list provided by Autoruns, and nothing pops out as the obvious answer.