@holger1405
Thank you for your help.
I have run the windows system file checker, and rebooted the computer.
This is the message:
"
Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. Med enerett.
C:\WINDOWS\system32>Sfc /scannow
Beginning system scan. This process will take some time.
Beginning verification phase of system scan.
Verification 100% complete.
Windows Resource Protection found corrupt files and successfully repaired
them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For
example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not
supported in offline servicing scenarios.
The system file repair changes will take effect after the next reboot.
C:\WINDOWS\system32>
"