Probleme mit Powershell-Code

# ##########################################################################################################################
# Funktionen:
# -----------


# Funktionen für die Kosmetik
function titel 
{
          clear-host
          write-host "PCINFO.PS1"  
          write-host "=========="  
          write-host " "  
          write-host "Aktueller PC: $PCName"  
          write-host "------------------------------------------------------------------------" -foregroundcolor cyan  
          write-host " "  
}

function Fusszeile
{
     write-host " "  
     Read-host "Druecke Enter fuer die Rueckkehr ins Hauptmenue"       
}


# ##########################################################################################################################


clear-host

# Eingabe des Nodenames
write-host "PCINFO.PS1"  
write-host "=========="  
write-host " "  
write-host "Willkommen bei PCInfo!"  
write-host "Dieses Script zeigt diverse Informationen ueber einen PC oder Server an!"  
$PCName = Read-Host "Gib bitte den Namen des PCs ein, der abgefragt werden soll "  


# Wird solange wiederholt, bis ExitVariable = true ist
Do {
     clear-host
     write-host "PCINFO.PS1"  
     write-host "=========="  
     write-host " "  
     write-host "Dieses Script zeigt diverse Informationen ueber einen PC oder Server an!"  
     write-host " "  
     write-host "Aktueller PC / Server: $PCName"  
     write-host "------------------------------------------------------------------------" -foregroundcolor cyan  
     write-host " "  
     write-host "Bitte waehle eine Funktion aus:"  
     write-host " "  
     write-host "(A) Allgemeine Informationen ueber den PC / Server anzeigen"  
     write-host "(B) Software-Informationen anzeigen"  
     write-host "(C) Installierte Patches/Hotfixes anzeigen"  
     write-host "(D) Laufende Prozesse auflisten"  
     write-host "(E) Dienste auflisten"  
     write-host "(F) Diskinformationen anzeigen"  
     write-host " "  
     write-host "(Y) Abzufragenden PC / Server wechseln"  
     write-host "(Z) Exit"  
     write-host " "  
     $auswahl = Read-Host "Deine Auswahl "  
     switch ($auswahl) {
          "A" {  
               titel
               write-host "Allgemeine Informationen ueber den PC / Server"   
               write-host "=============================================="   
               write-host " "  
               write-host "Computerinformationen :"  
               write-host " "  
               get-wmiobject -class win32_computersystem -computername $PCName
               write-host " "  
               write-host " "  
               write-host "Betriebsystem-Informationen :"  
               write-host " "  
               get-wmiobject -class win32_operatingsystem -computername $PCName
               write-host " "  
               write-host " "  
               write-host "BIOS-Informationen :"  
               write-host " "  
               get-wmiobject -class win32_bios -computername $PCName
               write-host " "  
               write-host " "  
               write-host "CPU-Informationen :"  
               write-host " "  
               get-wmiobject -class win32_processor -computername $PCName | select-object -property DeviceID, Manufacturer, Name, Description, CPUStatus, CurrentClockSpeed, MaxClockSpeed, SocketDesignation, AdressWith, DataWidth, l2cachesize, ExtClock
               write-host " "  
               write-host " "  
               write-host "Informationen ueber den/die Grafikchip(s) :"  
               write-host " "  
               get-wmiobject -class win32_VideoController -computername $PCName | select-object -property DeviceID, Description, Status, VideoProcessor, AdapterRAM, CurrentHorizontalResolution, CurrentVerticalResolution, CurrentBitsPerPixel, InstalledDisplayDrivers, DriverVersion, InfFilename, InfSection   
               Fusszeile
          }
          "B" {  
               titel
               write-host "Installierte Software :"  
               write-host " "  
               get-wmiobject -class win32_product -computername $PCName | select-object -property Name, Version, Vendor | sort-object -property Name, Vendor, Version
               Fusszeile
          }
          "C" {  
               titel
               write-host "Installierte Patches/Hotfixes :"  
               write-host " "  
               get-wmiobject -class Win32_Quickfixengineering -computername $PCName | select-object -property HotFixID, Description, ServicePackInEffect | sort-object -property HotFixID, Description, ServicePackInEffect
               Fusszeile

          }
          "D" {  
               titel
               write-host "Laufende Prozesse auf $PCName :"  
               write-host " "  
               get-wmiobject -class win32_process -computername $PCName | select-object -property processname, path, processid | sort-object -property processname, processid, path
               Fusszeile
          }
          "E" {  
               titel
               write-host "Dienste auf $PCName :"  
               write-host " "  
               get-wmiobject -class win32_service -computername $PCName | select-object -property Name, State | sort-object -property State, Name
               Fusszeile
          }
          "F" {  
               titel
               write-host "Diskinformationen von $PCName"  
               write-host "================================="  
               write-host " "  
               write-host "Physikalische Informationen :"   
               get-wmiobject -class Win32_Diskdrive -computername $PCName | select-object -property DeviceID, Model, Partitions, Size | sort-object -property deviceid
               write-host " "  
               # $laufwerke = get-wmiobject -class Win32_LogicalDisk -computer $PCName
               # write-host " Laufwerk Groesse(MB) Freier Platz(MB)" 
               # ForEach ($laufwerk in $laufwerke)
               # {
               # write-host " {0} {1,15:n} {2,15:n}" -f $laufwerk.DeviceID, ($laufwerk.Size/1m), $($laufwerk.freespace/1m) 
               # }
               Write-host "Fuellstand laeuft noch nicht!"  
               Fusszeile
          }
          "Y" {  
               $PCName = Read-Host "Gib bitte den Namen des Kuebels ein, der abgefragt werden soll "  
          }
          "Z" {  
               $ExitVariable = "true"  
          }
          default {
               titel
               write-host " "  
               write-warning "Falsche Eingabe! Eingabe muss entweder A, B, C, D, E, Y oder Z sein!"  
               Fusszeile
          }
     }

} While ($ExitVariable -ne "true")