I beleive this is a microsoft glitch as the same thing is happening to me on Win XP. The updates are actually installing. You can check your control panel/programs. Check "show updates" and you should see them. You can also run windows update's 'review history" and see that they installed successfully. The last time I saw something like this happen, I just waited a few days until microsoft resolved the problem.
If it's annoying, disable automatic updates for a week (or until microsoft fixes it), then turn it back on again.
Exactly! Thank you very much. I tought it were something "serious".