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#21
Need to click on the X for errors and see what they are, at a guess probably mostly the same error.
Open admin command prompt, copy and paste the command below then run to fix any corrupted system file(s):
dism /online /cleanup-image /restorehealth&sfc /scannow&pause
This kept driving me crazy too, it might be related to explorer searching for shared files/computers.
If you do not use any, you can disable sharing services. I think: Server, Webclient, Workstation.
You can check by stopping the services, if it helps, then you can disable them.
To stop them, run CMD as admin and copy/paste (then check explorer):
net stop LanmanServer /y
net stop LanmanWorkstation /y
net stop WebClient /y