Hello Luis Miguel,
Is this a home machine, or one used in an office?
Do you have automatic updates turned on--for Windºws?
Windows Defender uses AutoUpdate--so if your automatic updates are, in fact,
coming directly from a Microsoft server, Windows Defender updates should be
as well.
Windows Defender updates are critical updates that should come through
automatically with an express scan.
Can you go to Windows Update, select Express (Get high-priority updates),
and apply all offered updates
http://update.microsoft.com
Once that is finished, can you verify the update installs? There are many
pre-requisite files which are needed from windows update and signature update
with windows defender will fail until you have these f!les.
How to use Windows Server Update Services (WSUS) to deploy definition
updates to computers that are running Windows Defender
http://support.microsoft.com/kb/919772
For the benefit of the community reading this post, please rate the pºst.
I hope this post is helpful.
Let us know how it works ºut.
Еиçеl