If you can allow some downtime, you could also reboot in safe mode to see if any previous update gets rolled back. I would try downloading and installing the latest service stack update from Microsoft Update catalog. Thanks for the suggestion, I've tried the first part, will take a look at the link and see if that helps out. I've tried slipstreaming the ISO and using that was a Source but get the same error. I've used DISM and specified another server for the Source location but it fails saying it can't see the source location even though it can. This machine used to be managed by SCCM but in my troubleshooting of this issue I've uninstalled that and even when it was installed trying to use Microsoft as the update source made no difference. I've tried download the update files from Windows Update catalog and installing them that way, they report as successful but again nothing shows in the Installed updates view and if you reboot the 'installed' update is offered in Windows Update and the manual install of the update is allowed again. No error message is given, check in Event Viewer and it shows a successful install but after a reboot Windows update presents the same updates to install and checking Control Panel for installed updates there have been none since Nov ! I'm fighting an issue with a Windows server server at the moment.

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