Sie können mithilfe eines Skripts automatisch nach Updates suchen und diese installieren. Dies funktioniert sowohl unter XP als auch unter Windows 7. 
Es gibt eine Reihe von Skripten zum Herunterladen,  hier ist meins : 
' Written in 2007 by Harry Johnston, University of Waikato, New Zealand.
' This code has been placed in the public domain. It may be freely
' used, modified, and distributed. However it is provided with no
' warranty, either express or implied.
'
' Exit Codes:
' 0 = scripting failure
' 1 = error obtaining or installing updates
' 2 = installation successful, no further updates to install
' 3 = reboot needed; rerun script after reboot
'
' Note that exit code 0 has to indicate failure because that is what
' is returned if a scripting error is raised.
'
Set updateSession = CreateObject("Microsoft.Update.Session")
Set updateSearcher = updateSession.CreateUpdateSearcher()
Set updateDownloader = updateSession.CreateUpdateDownloader()
Set updateInstaller = updateSession.CreateUpdateInstaller()
Do
  WScript.Echo
  WScript.Echo "Searching for approved updates ..."
  WScript.Echo
  Set updateSearch = updateSearcher.Search("IsInstalled=0")
  If updateSearch.ResultCode <> 2 Then
    WScript.Echo "Search failed with result code", updateSearch.ResultCode
    WScript.Quit 1
  End If
  If updateSearch.Updates.Count = 0 Then
    WScript.Echo "There are no updates to install."
    WScript.Quit 2
  End If
  Set updateList = updateSearch.Updates
  For I = 0 to updateSearch.Updates.Count - 1
    Set update = updateList.Item(I)
    WScript.Echo "Update found:", update.Title
  Next
  WScript.Echo
  updateDownloader.Updates = updateList
  updateDownloader.Priority = 3
  Set downloadResult = updateDownloader.Download()
  If downloadResult.ResultCode <> 2 Then
    WScript.Echo "Download failed with result code", downloadResult.ResultCode
    WScript.Echo
    WScript.Quit 1
  End If
  WScript.Echo "Download complete. Installing updates ..."
  WScript.Echo
  updateInstaller.Updates = updateList
  Set installationResult = updateInstaller.Install()
  If installationResult.ResultCode <> 2 Then
    WScript.Echo "Installation failed with result code", installationResult.ResultCode
    For I = 0 to updateList.Count - 1
      Set updateInstallationResult = installationResult.GetUpdateResult(I)
      WScript.Echo "Result for " & updateList.Item(I).Title & " is " & installationResult.GetUpdateResult(I).ResultCode
    Next
    WScript.Quit 1
  End If
  If installationResult.RebootRequired Then
    WScript.Echo "The system must be rebooted to complete installation."
    WScript.Quit 3
  End If
  WScript.Echo "Installation complete."
Loop
Sie führen es von der Kommandozeile wie folgt aus: 
cscript wsusupdate.vbs
Mein Skript ist nur minimal funktional, kann aber trotzdem nützlich sein. Es gibt andere solche Skripte mit vielen zusätzlichen Funktionen, versuchen Sie eine Google-Suche.