Windows 10: Windows is activated, still can't set photo as desktop background

Ok, so I went to change my desktop photo to a different image, and now it won't let me. I don't want a stock theme, I want my photo. Why is this happening? My Windows is activated and up to date. There's been no trouble before now. I've tried numerous solutions from a YouTube video which I can't find now, such as deleting the display adapter NVIDIA driver and reinstalling it, running regedit, and others I can't recall. When I go to try to use a photo as a desktop image, all it does is show the loading blue circle cursor, and then I get a black background. Using Personalization, when I clic

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Lost desktop background

I did a Search & Distroy spyware scan the other day, and one of the suggested "fixes" said something about removing Active Desktop. Like the muppet I am I clicked yes and am now without a desktop background picture.

Does anyone have an idea how to reverse this? If I try to select a picture it's simply not added as a background.

 

Lost desktop background

The thing is I have no spyware; I've done scans with different pieces of software and they all confirm this. The active desktop bit that was removed by Search & Destroy is, I think, a pure Windows thing and I've seen it being listed in Search & Destroy scans on both this and other PCs before.

The thing is that this time I was trying to be clever and pressed "delete" whereas before I just ignored it. I've undone the Active Desktop removal in Search & Destroy and also followed your tips above but it makes no difference - still no desktop background. Any other ideas or do I just wait until the next reformat?

 

Windows 10 Desktop background photo not changing


Setup - two monitors. Nvidia Quatro graphic card

Desktop background problem
I have set Personalisation - Desktop Background - Slideshow - Set Location to a Photo folder to use Photos - Change every minute - Shuffle Off (tried On as well but makes no difference) - Fit set to Fit.

Problem is that the images never change, though they are different ones on the two monitors.

I have tried various permutations of the above without any success. Which folder of photos I use doesn't make any difference to the situation - same two photos displayed.

My wife's laptop which is setup in the same way seems to have a similar but not identical problem. hers changes but only selects from 4 photos despite more being available in the chosen folder.

Suggestions appreciated!