Windows defender problem in Vista?

I took delivery of my new desktop which has Vista Business edition. All works fine but i have noticed that Windows Defender is turned off! All settings seems fine. If i go into Windows Security Center and click on Windows Defender "turn it on now", it will look for possible updates for Defender but it remains turned off!

Am i overlooking something here?

Many thanks
Rene de Heer

Hi Rene.

Clicky here - http://blogs.devsource.com/devlife/content/vista/windows_defender_wont_turn_on_1.html

(quote)
Try this:
Right-click Command Prompt and Run as Administrator. Type the following command:
winmgmt /verifyrepository
If the system returns "WMI repository is not consistent", run this command:
winmgmt /salvagerepository
The first time you run this it will fail. (It will issue stop commands to the services causing it to fail. It might take a couple minutes for the services to shut down). Run the command again. You actually may have to run it 3 times before it finally runs and completes on its own.
Reboot your system.

Rene i found another way.........................

Start->Search type cmd and command prompt will show up->Right click->Run as
administrator and then type the commands as follows

Cd c:\windows\system32\wbem
ren repository repository.old press enter and reboot

If this doesn't help start the computer in safe mode and rename the folder
in safe mode.

If it still doesn't works turn off UAC and then try to rename it with
elevated command prompt in normal mode.

If it still doesn't works up then right click on the repository folder under
c:\windows\system32\wbem and go to properties ->Security Tab->Click
advanced->Ownership->Check replace owner on the subcontainers and
objects->Select your user name or administrators and click apply and then
OK(Twice)
Then click add (In the security tab) and then on the next window type
everyone and click OK.Ensure to give all permissions to everyone and click OK.

Rename the folder now.

Alan, thanks a lot! All sorted!
Rene de Heer