[scripting] Powershell - Uninstall Microsoft Updates

[Lai, Jerry]

I have a PS script that when I launch interactively/manually, it runs perfectly 
fine from the NETLOGON share.  But When I add it into the GPO computer 
logon/start up script, it doesn't work??

Do I need to some services started before I can run this PS script to uninstall 
MS Updates?

Thanks in advanced,
Jerry

Jerry Lai
Systems Engineer, Desktop Management
Herbert Smith Freehills

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$PatchList = 
@("KB2553154","KB2899519","KB2910902","KB3008923","KB3012176","KB3013126")

function Remove-Update
{
        $HotFixes = Get-HotFix
        
        foreach ($HotFix in $HotFixes)
        {
                foreach ($KBID in $PatchList)
                {
                        if ($KBID -eq $HotFix.HotfixId)
                        {
                                "Inside first if"
                                $KBID = $HotFix.HotfixId.Replace("KB", "") 
                                $RemovalCommand = "wusa.exe /uninstall 
/kb:$KBID /quiet /norestart"
                                Write-Host "Removing $KBID from the target."
                                Invoke-Expression $RemovalCommand
                                break
                        }                       
                        if ($KBID -match "All")
                        {
                                $KBNumber = $HotFix.HotfixId.Replace("KB", "")
                                $RemovalCommand = "wusa.exe /uninstall 
/kb:$KBNumber /quiet /norestart"
                                Write-Host "Removing update $KBNumber from the 
target."
                                Invoke-Expression $RemovalCommand
                        }                       
                        if ($KBID -match "Security")
                        {
                                if ($HotFix.Description -match "Security")
                                {
                                
                                        $KBSecurity = 
$HotFix.HotfixId.Replace("KB", "")
                                        $RemovalCommand = "wusa.exe /uninstall 
/kb:$KBSecurity /quiet /norestart"
                                        Write-Host "Removing Security Update 
$KBSecurity from the target."
                                        Invoke-Expression $RemovalCommand
                                }
                        }
                        while (@(Get-Process wusa -ErrorAction 
SilentlyContinue).Count -ne 0)
                        {
                                Start-Sleep 3
                                Write-Host "Waiting for update removal to 
finish ..."
                        }
                }
        }

}

Remove-Update