I'm a Tier 2 Technical Support for a big corporation myself and to tell you the truth, right now if I were in your shoes, I would just re-image that workstation. We've been working on this issue for over 10 days now. Here, if I cannot solve a Windows Update issue within a day (or a few hours), I just re-image the workstation since it's way, way faster that way. We can try to troubleshoot that issue or you can re-image the workstation. The choice is yours :)