This is a little script which updates via PowerShell the operating system

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#Define update criteria.

$Criteria = "IsInstalled=0 and Type='Software'"

#Search for relevant updates.

$Searcher = New-Object -ComObject Microsoft.Update.Searcher

$SearchResult = $Searcher.Search($Criteria).Updates

#Download updates.

$Session = New-Object -ComObject Microsoft.Update.Session

$Downloader = $Session.CreateUpdateDownloader()

$Downloader.Updates = $SearchResult

$Downloader.Download()

#Install updates.

$Installer = New-Object -ComObject Microsoft.Update.Installer

$Installer.Updates = $SearchResult

$Result = $Installer.Install()