There's not a single cause for failure. Is it failure to download, failure at install, or ?
Are you observing the process when it fails? If so, what message do you see?
Is there any specific updates that fail....that you can remember?
It would be easier for you to go to Windows Update and see if that process works.
Select Windows Update from the main menu--> All programs menu.
If you get an error there, please write all down verbatim (with 'error' number notations) and post it back here.
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