Hi James - I've got to dash off in a minute, so I'll be brief (for a change :))
Seems to me that F-prot and Iobit would conflict with each other, no? I only glanced, by I thought Iobit had added antivirus functions to their last few versions of their product? Of course - only one "full-time" (real time, always-on) antivirus can be installed on a system (for best results, anyway).
Most of the reports I've seen regarding Store & Photos misbehavior such as you are seeing - involve files gone missing (or simply not being found by the apps).
I don't have time right now to check the PowerShell commands, but there are some folks who have used PowerShell to help fix only one app at a time. I don't think you need to worry too much about trying one at a time, you can always use System Restore to go back.
Good luck!