Hello,
We recommend running the following PowerShell script to re-register the windows Store:
1. In the Search box, type in CMD
2. Right click on Command Prompt and choose Run as administrator
3. In the command prompt, enter the following command:
PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage Microsoft.WindowsStore).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register $manifest}"
4. Restart your PC and try again to launch the Windows Store.