My Windows started to have similar problem yesterday. The Windows Security
Center showed Windows Defender is out of date. but after mannual update, I
received a message: "There are no new definitions available to download for
Windows." In Windows Defender, it states Real-time protection is on and
Definition version is 1.43.73.0 created on 9/4/2008.
I have tried Mohit Kapoor's solution, but have some problem as Grich had.
After I run winmgmt/verifyrepository, system responded "WMI repository is
consistent".
"Hornet" wrote:
Quote:
> I have Windows Defender running normally on Windows Vista (the task-bar icon
> is showing that Defender is on and running ok) but the Security Center is
> telling me that Windows Defender is turned off and there is a button to turn
> it on. However, when I press the Turn On button (even though I know it is
> already turned on) I get the message: "Security Center is updating
> definitions for Window Defender". After "searching for definitions" I get
> the message: "There are no new definitions available to download for Windows
> Defender". I'd like to solve this because the Security Center icon is always
> showing me that I have a Security Alert.