Over the course of years working in IT (many moons ago), I would run into issues, not caused by the end-user; but, caused by an external “trusted” source that pushed as an update to the network. I can remember a time my MS-Excel shares on the network stopped working and it drove me nuts trying to find the cause. In that case an antivirus update was the culprit. There also has been occasions where “Windows Updates would cause issues (and is one of the reasons IT Professionals will often delay updates). Anyhow, Gizmo’s has a post up highlighting a utility that may help you with fixing a Windows update issue at home…
If you’re having trouble with Windows Update, give this small, free tool (called Fix WU Utility) a try.