$targets = @()
$folders = dir "D:UsersForzaMusic" | Where {$_.mode -match "d"}
foreach ($folder in $folders) {
     if(
        ($folder.GetFiles() |
         Measure-Object |
         Select -ExpandProperty Count) -eq 1)
        {$targets += $folder}
}
$targets | Format-Table -Property Name

foreach ($target in $targets){Remove-Item -Recurse -Force $target.FullName}

ls I:temp | ?{$_.PSIsContainer} | ?{(ls $_.FullName | ?{-NOT $_.PSIsContainer}).Count -eq 1} | %{Remove-Item $_.FullName -WhatIf}