Try this; it worked for me....
http://support.microsoft.com/kb/915105
Enjoy!
"Multiplynl" wrote:
> And I SOLVED the problem in a couple of minutes:
>
> Just reinstall the windows defender beta 2 version.
>
> After this the defender starts a complete system check, after that I went to
> the windows update site and checked for updates. What happend? Nothing!
>
> When checking the update history i noticed that the last update that gave
> the error message was installed o.k.!
>
> Good luck
> "Callalily" wrote:
>
> > For what it's worth, i'm having the same problem too.
> > --
> > Callalily
> >
> >
> > "Oz" wrote:
> >
> > > I am having problem updated my Window Defender. I keep getting same error
> > > message for the last 3 days. I was able to update everthing alse except
> > > Defender defenition. I did run windows Genuine validation came out fine.
> > > Please help.