Dear Starfish[xy33],
First make sure that you don't have any Windows Update available for your computer. If there is, install it, restart and check if your issue is fixed.
As mentioned before go to the Command Prompt as an administrator and copy paste the following lines, one after another, pressing Enter after each line :
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth
Restart and check if the issue is fixed.
Regards,
Hadrien