You need reinstall Store. Type PowerShell in Start Search, right click to Run as Administrator, copy the following code and paste it into , press Enter:
PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage *WindowsStore*).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register $manifest}"
Restart the computer
