Update Installation - installs available updates from WSUS, Microsoft Update or Windows Update.On one machine running Windows 10 Threshold 2 (TH2), the windows update agent does not appear to be working.Anyone doing a fresh install of Windows 7 should manually install SP1 (if needed).The Windows Update Agent was renamed to Windows Update Client.Once done, you should restart your Windows computer.This tool works on Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 as well as Windows 10 and can be downloaded from Tech Net.Windows Update Troubleshooter is another tool that can help you fix Windows Update problems.There are also several other links at the end of that post that can help you troubleshoot Windows Update problems.
Once you do that, you will see several messages – a few of which I have displayed below in the image – where you will see Services being stopped, Services being started, cleanup work being executed, etc.
According to Microsoft, there are five parts to the WUA: Service Availability - detects, downloads and installs Windows updates and updates for other programs.
Server Connectivity - an application program interface (API) that allows client computers to connect to the WSUS server or Microsoft's update websites.
Update Detection - checks for and installs updates daily.
Update Downloads - downloads available updates from WSUS, Microsoft Update or Windows Update.