Change Photo om desktop when computer shuts dow and reopened

Open File Explorer.

Paste this into the address bar and press Enter.

%AppData%\Microsoft\Windows\Themes

In the resulting folder, delete the TranscodedWallpaper file and the CachedFiles folder.

Restart (not shut down) your PC.

Then open the Settings app, go to Personalization - Background and set your preferred wallpaper image from there.

To change the photo that appears on your desktop when you start your computer, you will need to configure the lock screen and desktop background settings. Here’s how you can do it:

1. Open Settings: Click on the Start menu and select the gear icon to open the Settings app.
2. Personalization: Go to the "Personalization" section.
3. Lock Screen: Select "Lock screen" from the left sidebar. Here, you can change the background image that appears on the lock screen.
4. Choose Your Picture: You can select a picture from your files or choose a predefined background. If you want to use a custom image, click on "Browse" to find your desired picture.
5. Desktop Background: To change the desktop background, go back to the "Personalization" section and select "Background". Here, you can choose a new image or a slideshow for your desktop background.

After making these changes, the new images should appear when you start your computer and when you lock your screen.

References:

• Configure the desktop and lock screen backgrounds (windows-10)
• Configure the desktop and lock screen backgrounds (windows-11)