File explorer window opens every time I exit full screen

Hi SekkeyWho

Considering you just reinstall Windows 10, you might be missing some pending updates.

Click Start > Settings > Update & security > Windows Updates > Check for updates.

Download and install any pending updates, restart then check if stability is restored.

Also...

Try these first to see if they work:

Open Start, type: CMD
Right click CMD
Click Run as administrator

Type in at the prompt OR Copy and Paste these one at a time : (Hit enter after each)

Dism /Online /Cleanup-Image /CheckHealth

Dism /Online /Cleanup-Image /ScanHealth

Dism /Online /Cleanup-Image /RestoreHealth

Also run the System File Checker utility:
Open Start, type: CMD
Right click CMD
Click Run as administrator

At the Command Prompt, type: sfc/scannow

This will check for any integrity violations

Restart your system

Check your hard disk for any errors:
Click Start
Type: CMD, from the results, right click Command prompt
Click 'Run as Administrator'
At the Command Prompt, type: chkdsk /r /f
Hit Enter
When you restart your system, your computer will be scanned for errors and attempts will be made to correct them.

Its possible there is an issue with your display driver.

Press Windows key + X
Click Task Manager
Select the Processes tab
Scroll down to Windows Explorer then select it
Click Restart

If that does not work:

uninstall your display driver:

Press Windows key + X
Click Device Manager
Expand Display adapters
Right click the current display adapter
Click Uninstall
Exit Device Manager
Restart

Hi SekkeyWho,
I am Vijay, an Independent Advisor. I am here to work with you on this problem.

To start with, please execute following steps and let me know

1. CTRL+SHIFT+ESC to start Task Manager
Locate Windows Explorer in Processes tab > Right Click > End Task
Now at the top File > Run new task > Put explorer.exe and Enter

2. Run SFC Scan & DISM
How to - https://answers.microsoft.com/en-us/windows/for...

3. Run Built-in & Guided Walk through Windows Update troubleshooter
Built-in : Windows Key+X > Click Settings > Click Update & security > Click Troubleshoot > Click Windows Update > Click Run the Troubleshooter

Guided Walk though - https://support.microsoft.com/en-us/help/10164/...

4. To test only - Create a New User Account and login with this new User Account to rule out corruption in user profile
https://support.microsoft.com/en-us/help/402692...

5. I would recommend that you perform a Windows 10 repair upgrade. Repair upgrade fixes all Windows errors and retains all files, applications and settings. (You will not lose any data while backup is a good idea) Below is a good guide to perform repair upgrade

https://www.tenforums.com/tutorials/16397-repai...

Disclaimer - This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Do let me know if you have any more question or require further help. I would be happy to work with you to take you though this problem.