If the store still will not function, reboot. If still not working, open the command prompt as the administrator and run the following command, then reboot once more.
PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage Microsoft.WindowsStore).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register $manifest}"
Right click start
Select Run
Type in: WSReset.exe
This will clear the cache if needed.