1
Open Task Manager (Ctrl + Shift + Esc).
Select the Processes tab.
Find Windows Explorer in the list.
Right click that process and select Restart.
Then check if that resolves the problem.
2
If that does not resolve the problem, open the Settings App.
Go to System - Recovery.
Click the Reinstall Now' button in the 'Fix problems with Windows Updates' section and wait for that process to complete, this process does not affect your files, settings or installed apps.