Mohit Kapoor

Please perform the following to resolve your issues.

Open elevated command prompt and type cd\windows\system32\wbem press enter

Then type ren repository repository.old and press enter.

Restart the computer and check your security center again hopefully
everything should be working there.

Thanks and Regards

Mohit Kapoor

"Hornet" wrote:

> 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.