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Windows update runs the same updates everyday, and says successfully downloaded


TROUBLESHOOTING STEPS
  1. Make a list of the updates. 
  2. Next select Start, Control Panel, Programmes and Features, View Installed Updates. 
  3. Check the list and remove any that appear in the list you prepared at the beginning. 
  4. Restart your computer and run Windows Update and let the updates reinstall. 
  5. When they have completed restart your computer and hopefully you will have fixed the problem.


What happened was that when the updates were first installed something interrupted the process so that the record of installed updates was not fully updated. The system think the updates are not installed so it tries to install the updates buts fails because the updates are already installed.