Hi Rishi,
This this post below by dean-dean should help:
<quote>
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.
</quote>
--
Regards,
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows® Troubleshooting
http://www.winhelponline.com
Winhelponline.com blog
http://www.winhelponline.com/blog
My security center reports my Windows defender as turned off.However
when i am trying to enable it by clicking "Turn on now" button,it
prompts UAC and than nothing is changed. I have PC tools antivirus
installed as a virus scanner.Does it affects the Windows defender?