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?

Try to start WD in Control Panel>Adminstrative Tools>Services.

"Rishi" <rishianitstigma******.com> wrote in message
news:220373c2-34e2-4b1e-993e-1c3132161d6c@n58g2000hsf.googlegroups.com...[color=blue]
> 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?[/color]

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 [url]http://www.winhelponline.com[/url]
Winhelponline.com blog [url]http://www.winhelponline.com/blog[/url]


"Rishi" <rishianitstigma******.com> wrote in message news:220373c2-34e2-4b1e-993e-1c3132161d6c@n58g2000hsf.googlegroups.com...
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?

I tried this more than 10 times, it still fails

never mins, worked after about 20

You tried what?!
--------
[When responding to posts, please include the post(s) you are replying to so
that others may know what the hell you are talking about]

[How to ask a question]
[url]http://support.microsoft.com/kb/555375[/url]
[url]http://dts-l.net/goodpost.htm[/url]
[url]http://oakroadsystems.com/genl/unice.htm[/url]


"makar" <makar@discussions.microsoft.com> wrote in message
news:B786D391-444E-4828-81AF-6D3559D14433@microsoft.com...[color=blue]
>I tried this more than 10 times, it still fails
>[/color]

"Brink" <Brink.36bpm0@no-mx.forums.net> wrote in message
news:Brink.36bpm0@no-mx.forums.net...[color=blue]
>
> Bob;647635 Wrote:[color=green]
>> You tried what?!
>> "makar" <makar@xxxxxx> wrote in message
>> news:B786D391-444E-4828-81AF-6D3559D14433@xxxxxx> > >[color=darkred]
>> > >I tried this more than 10 times, it still fails[/color][/color]
> Bob,
>
> You can look at the few posts above it to see, but this is it.
>
> 'Unable to enable Windows Defender application in Windows Vista'
> ([url]http://support.microsoft.com/kb/555962[/url])
>
> Shawn
>[/color]

Hi Shawn,

The point I was trying to make, obviously not very well, is the importance
of quoting relevant information. Doing so benefits the OP by increasing the
number of people that see his problem, therefore increasing his chances of
receiving a solution.

I know I can look at the posts above it to see. For time saving and
efficiency I "hide read messages".