Silent install of WSUS updates

#Defines update criteria: we're interested in "software" (i.e. Windows/ Office, not drivers or anything) that are not yet installed
        $newUpdateCriteria = "IsInstalled=0 and Type='Software'"

#Search for new updates.
        $newUpdateSearcher = New-Object -ComObject Microsoft.Update.Searcher
        $newSearchResults = $newUpdateSearcher.Search($newUpdateCriteria)

        If ($newSearchResults.updates.Count -eq 0)
        {
                Write-Host "I couldn't find any updates..."
                Start-Sleep 5
        }
        Else
        {
        #Download updates.
                $updateSession = New-Object -ComObject Microsoft.Update.Session #creates a new update session object
                $downloader = $updateSession.CreateUpdateDownloader()           #creates an object for downloading the updates
                $downloader.Updates = $newSearchResults.Updates                 #assigns the objects found above to the download object
                $downloader.Download()                                          #downloads the updates

                #Install updates
                        $installer = New-Object -ComObject Microsoft.Update.Installer   #creates a new update installer object
                        $installer.Updates = $newSearchResults.Updates                  #uses the updates from the initial search to populate what to download
                        $installUpdates = $Installer.Install()                          #installs the updates

                        #Reboot if required by updates.

                        If ($installUpdates.RebootRequired -eq $true)
                        {
                                Write-Host "This computer needs to be restarted"
                        }
                        Else
                        {
                                Write-Host "Reboot NOT required!"
                                Start-Sleep 5
                        }
                }