Fix variable reference in string

count-ad-objects.ps1

@@ -42,7 +42,7 @@ debug "Creating PSCredential object..."
 $psCreds = New-Object -typename System.Management.Automation.PSCredential -argumentlist $user, $secpass
 
 # Copy AD module files from wintools to correct locations
-$dest = "$RootDriveLetter:\windows"
+$dest = "${RootDriveLetter}:\windows"
 robocopy /s /r:3 /w:5 $ADModuleSource $dest *.* 2>&1
 
 # Import PowerShell AD module