http://support.microsoft.com/?kbid=915105
Use the resolution steps in the above KB article.
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"hayo" <(E-Mail Removed)> wrote in message
news

BA29408-624D-4C64-83F2-(E-Mail Removed)...
>I have WindowsDefender Beta2, version 1.14.1315.1 (8.3.2006), running.
> The Windows update now notifies me about an updated version 1.14.1361.6.
> The download and the subsequent install on my computer runs without
> problem,
> final message is "computer updated successfully".
>
> But unfortunately, that is not true: The old version is still installed,
> and
> again I get the notification from the Windows update program, that a new
> version is available....
>
> Whats wrong here ? Why isn't my WindowsDefender installation udated ?
> --
> Thanks and regards
> Hayo