- Are you trying to change the desktop background (wallpaper) as shown here:
https://www.howtogeek.com/753798/how-to-change-...
Troubleshoot changing background wallpaper:
https://thegeekpage.com/fix-cant-change-desktop...
- If this doesn't help then what can sometimes fix this is to Reset the theme by setting a new Theme from Settings > Personalization > Themes or from the many spectacular free Themes you can download from the Store to that Themes panel to choose from: https://www.microsoft.com/en-us/store/collectio.... Try at least one now.
To get color back on the task bar, start menu and window frames after Version 1903 turned the Light theme dull grey follow this guide:
https://answers.microsoft.com/en-us/windows/for...
To get the spectacular scenic backgrounds back on the Lock screen when the PC first starts up, go into Settings > Personalization > Lock Screen and set the drop down menu to Windows Spotlight.
If you want the Fun Facts you can hover the mouse over on the Lock Screen or click to go to info pages about the scenes, change dropdown temporarilty to Picture, tick the box to Get fun facts, then change it back to Windows Spotlight.
More about personalizing by customizing appearance here:
https://www.windowscentral.com/how-customize-lo...
https://www.howtogeek.com/225893/how-to-persona...
To save a Windows 10 custom Theme so you can reapply it when Updates or Version mess it up, see here:
https://www.tenforums.com/tutorials/41564-save-...
- The Display driver is so important here that merely updating it is sometimes not enough. So let's try everything possible to get it working correctly:
First make sure you have updated the Display driver from the PC or Display adapter maker's Support Downloads web page for your exact model number, HP Serial Number or Dell Service Tag - from the sticker on the PC.
While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3 and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.
If necessary first remove the old driver using DDU https://translate.google.com/translate?sl=auto&... (not necessary with Microsoft Basic driver which is a placeholder if nothing else is available) and/or install in Safe Mode with Networking (so you have internet), or Safe Mode, accessed by one of these methods: https://translate.google.com/translate?sl=auto&...
If new driver still won't install DDU see Lightning Leon's Answer here: https://translate.google.com/translate?sl=auto&...
If this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here: https://translate.google.com/translate?sl=auto&...
or the Nvidia Geforce updater here: https://www.nvidia.com/nl-nl/geforce/geforce-ex...
or the AMD autodect utility here: https://translate.google.com/translate?sl=auto&...
For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver.
You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.
Then you will know you've tried everything in addition to Windows Update drivers.
Adjust the screen resolution until it fits and looks best at Settings > System > Display.
Then if objects are too small, adjust their Scaling in Settings > System > Display. Start at 125% and if that's not right do a Custom scaling.
Check for WIndows Updates to see if a new monitor driver is delivered based on changes made to Display driver.
Based on the results you reply back with, I may have other steps to try. Keep me posted on your progress as I will be here to help until the case is resolved.
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