Has Microsoft restricted its Windows Update to registered users only?  At first it scanned, then tried to install the
downloaded updates.  Then it froze.  Then it woudn't scan anymore.  I rebooted twice - same result.

sdflkj fumbled, fiddled and fingered:

The least you should do before trying any suggestions below is to delete
your History, Cookies and Downloaded Program Files from Internet
Explorer>Tools>Internet Options>General Tab>

Clear History & Delete Cookies... & Delete Files... & Settings...> View
Objects>select all objects then right click and select Remove

if no joy after that then look here

http://v4.windowsupdate.microsoft.com/troubleshoot/

Make sure you are logging in with Administrator rights.  I had that happen
one time.

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