All the updates are still on your system.
They just don't show on the Update page anymore.
Doing this will cause it. Windows Update - Reset
This is the "Note" at the top of the tutorial.
Resetting Windows Update using this option will clear the view update history details list.
This will not actually uninstall any of your currently installed Windows Update. They will just not be listed anymore. Any Windows Update installed after the reset will show up in the view update history list as normal though.
Installing IE9RC made my list empty.
So it now shows only updates after early Feb. 2011.
They are all still on the OS so you are safe.
Download the KB977165 manually here. http://www.microsoft.com/downloads/e...f-429b7106cd91
Download the KB2393802 manually here. http://www.microsoft.com/downloads/e...displaylang=en
That should resolve your problem.