Here is a PowerShell script that will force the Windows Update agent to detect updates against the Microsoft Update servers. It will override any GPO settings in place, restart the Windows Update service, and force an update detection via the Windows Update Agent COM API. Remove-Item -Path HKLM:\Software\Policies\Microsoft\Windows\WindowsUpdate -Force -Recurse -ErrorAction SilentlyContinue; Stop-Service -Name wuauserv; Start-Service -Name wuauserv; (New-Object -ComObject Microsoft.Update.AutoUpdate).DetectNow();

<ComImport(), Guid("673425BF-C082-4C7C-BDFD-569464B8E0CE"), TypeLibType(CShort(&H10C0))> Public Interface IAutomaticUpdates
<DispId(&H60020001)> Sub DetectNow()
<DispId(&H60020002)> Sub Pause()
<DispId(&H60020003)> Sub [Resume]()
<DispId(&H60020004)> Sub ShowSettingsDialog()
<DispId(&H60020005)> ReadOnly Property Settings() As <MarshalAs(UnmanagedType.Interface)> IAutomaticUpdatesSettings
<DispId(&H60020006)> ReadOnly Property ServiceEnabled() As Boolean
<DispId(&H60020007)> Sub EnableService()
End Interface