Security Center says that Windows Defender is turned off

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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.

[petar]

I have exactly the same problem. I just installed Windows Vista business
version. It is annoying. Can we send this problem to Microsoft?

Can you please help me? I have the same problem as described above but the fix is not working!

I get this messsage:

"WMI repository verification failed
Error code: 0x80004002
Facility: <Null>
Description: No such interface supported"

[subtitles]

Thanks for the fix. I've been looking for this for months now. It had happened on another computer and I was worried it was a sign of malware.

The second fix works a charm. You need to restart after you run it the 2 or 3 times for the warning to go away.

Wahey.

[perculator]

I have been running fine for months now. Just yesterday the stupid icon for my netowk connection gets x ed out red but i am still connected. Also same with security center AVG 7.5 not recognized but still running and also windows defender won't turn on. The fix doesn't work for me either. The only thing i did last night that may havwe caused something was updated my aim from 6.0 to 6.5 and i also deleted my browsing history, cookies , and deleted temp internet files. None of this should have caused this to happen. please helllpppp!!!!1

I am having the same issues listed. windows security red alert icon is
present each time I start my computer. Just until recently defender has been
working fine- in the security center it says that Malware protection/virus
protection is not located on my computer. Then it says that Defender is off.
I try to turn on but comes back with message that says that there are no new
definitions avail to download to defender.

I need help...

Did you run 'command' from an Elevated Command Prompt first ?

0x80041003 signifies that command is not running with Admin perms.

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".

I do not have any other software; except for AVG, my system is entirely
protected by Microsoft (for good or ill <g>), but i periodically get a
message saying Windows Defender is turned off. In Control Panel, WD tells me
"No unwanted or harmful software is detected. Your computer is running
normally." (This would suggest that WD is in business.) When i click on the
Security Center icon (the shield), it allows me to turn WD back on, but then
i get that message that says "There are no new definitions available to
download for Windows Defender," looking like an error message.

So, at the moment, WD is running, but i'd like to know what is turning it
off, which always happens when i reboot, but also at other times.

I just got the same problem and went all over the internet to find a fix. the
only thing you have to do is download and install windows vista service pack
1. after i finished installing it started working just like normal.

do u noe how 2 get rid off system32 on vista

[Stesal]

Hi,
I had the same problem, fortunately AVG have released a patch to fix the problem with Vista 32bit. http://www.avg.com/filedir/util/support/delrepwv_en.exe
This should resolve the problem, it did mine!

Ken-U spec N-Gleeesh?

Wha?