What causes my desktop image get pixelated suddenly? Also thumbnails no longer displayed

I have been using windows 7 for a while now, and it never happened.

Everything was fine yesterday, but now I come home and I find my desktop background image really pixelated.

I had not really changed anything on my computer recently, it happened all of a sudden. My images have a good resolution, I got them on my background because I installed windows 7 and they never looked bad, today, I went and they were like this...

Also, I have a lot of photos on the bottom and I can confirm that they are all like that, they are all of high quality and it shouldn't really happen, there never before...

Just as I was typing this, I also noticed that the folder thumbnails appear no more... And my records have some weird icons... What is going on?
This happens only on Explorer, on image viewer, I see the images very well, and when I was downloading the images I saw records very well also...

I enclose a few images of the incident so you can see clearly what is happening.

The original screen background example
My desktop computer
My library with weird folder icons
No thumbnails

Hello

Thanks for posting your question on the Forums of community of Microsoft.
 
What is the brand and model of the computer?
 
I suggest to refer to the links and follow the steps in the articles.
 
Change your screen resolution
 
Get the best display on your monitor
 
If the problem persists, please update the drivers of display card and check.
Reference:
 
Hope this solves the problem.

Tags: Windows

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