When windows 10 is not functioning properly

OPEN CMD AS ADMIN
# 1. use the System File Checker (SFC) command tool to repair the current setup

sfc /scannow

# 2. perform a quick check

DISM /Online /Cleanup-Image /CheckHealth

# 3. performs a more advanced scan to determine if the OS image has any problems

DISM /Online /Cleanup-Image /ScanHealth

# if everything else fails, use the following
# scan and repair common issues automatically

DISM /Online /Cleanup-Image /RestoreHealth

# run sfc again

sfc /scannow

Credit: Mauro Huculak