Windows Powershell script for displaying directory sizes. Just copy it into the root directory and execute the script with Powershell.

du.ps1

Get-ChildItem -Directory | ForEach-Object { 
  "$_"
  cd $_
  switch((ls -r|measure -s Length).Sum) {
    {$_ -gt 1GB} {
      '{0:0.0} GB' -f ($_/1GB)
      break
    }
    {$_ -gt 1MB} {
      '{0:0.0} MB' -f ($_/1MB)
      break
    }
    {$_ -gt 1KB} {
      '{0:0.0} KB' -f ($_/1KB)
      break
    }
    default { "$_ bytes" }
  }
  cd ..
  ""
}
Read-Host -Prompt "Press any key to exit"