Get-StartApps missing

Hello,

I have two x64 installations of Windows 10. Because there are problems with start menu if many apps are present I used powershell to enumerate the apps with

Get-StartApps | measure

One one Windows 10 installation all is fine. The other tolds me that the cmdlet is unknown. The module StartScreen is missing in this installation. I've tried some things to repair the problem but nothing helped.

On both machines the following modules are loaded:

Microsoft.PowerShell.Management, Microsoft.PowerShell.Utility

What could be wrong?

Thanks for any help!

Harald