Since screenshots can be easily caused by a flaky printscreen key, there's the keyboard angle.
Scan with Grif's help at http://www.cnet.com/forums/discussions/how-to-remove-pup-option-603542/#post-f742c795-5881-433b-a29b-6d758efe5cd3
I need your help and am concerned about my security. When I am browsing in line, it seems that there are times when my computer is taking screenshots without me doing anything. Is this a new virus? or a setting that I accidentally turned on? I am very concerned about this. I am on windows 10. The browser is chrome, and I have AVG free version virus protection. I scanned my computer manually, although I have it scheduled to scan once a day, but it is still doing it. Any info on this would be greatly appreciated.