Feb 202008

When you check Windows Defender in your vista system it may be off. When you try to opened up the security center and clicked “Turn on Now”. It went through it’s update check, reported no updates and continued to say that it was not turned on.Try this solution to fix this problem the solution try to rebuilding the WMI repository.


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.

Now you need to Reboot your system.

That’s it now your windows defender should turned on

More details

Winmgmt is the WMI service within the SVCHOST process running under the LocalSystem account. In all cases, the WMI service automatically starts when the first management application or script requests connection to a WMI namespace.

winmgmt /verifyrepository

Performs a consistency check on the WMI repository. When you add the /verifyrepository switch without the <path> argument, then the live repository currently used by WMI is verified. When you specify the path argument, you can verify any saved copy of the repository. In this case, the path argument should contain the full path to the saved repository copy. The saved repository should be a copy of the entire repository folder.

winmgmt /salvagerepository

Performs a consistency check on the WMI repository, and if an inconsistency is detected, rebuilds the repository. The content of the inconsistent repository is merged into the rebuilt repository, if it can be read. The salvage operation always works with the repository that the WMI service is currently using.

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  12 Responses to “Fix for Windows Defender won’t turn on error in Vista”

  1. Just wanted to thank you for the above instructions! Running Vista Home Premium, Windows Defender wouldn’t turn on. Followed above instructions; problem solved!! :)



  2. Thanks for the fix.. worked great!



  3. I tried this fix, but it says, “WMI repository is consistent”. When I open Windows Defender it says that WD is not turned on. I select to turn it on. The program opens, downloads new definitions, recommends a scan- which I do. Then I close the Window, but it never shows up in my taskbar. If I open Windows Defender again, it says that it is not running. Any ideas? Any help would be greatly appreciated.


  4. http://www.ehow.com/how_5204533_fix-windows-defender-not-open.html gives an alternative method – but this is a nice, easy one, too

    thx for the advice

  5. Tried your fix and it failed to restart defender I got the same result as Nick

  6. Tried this and I got “WMI repository is consistent” as well. Still not working right!!!!

  7. Why is it that Bill Gates can come up with some shit like Microsoft and it not work worth a shit and we can’t make them buy it back from us? The Defender problem is still a problem for me. Can’t get the goddamn thing to turn on. Goodbye Microcrap.

  8. Been there, done that! And Defender still WILL NOT TURN ON!?!?

  9. I am also having a problem with Windows Defender not starting when I attempt to run the program so I followed your instructions above and rec’d text stating “WMI repository IS (emphasis added) consistent”. Now what do I do? Go ahead and follow the remaining instructions anyway?

  10. I have a windows defender install in vista. It is installed by default. It comes up with 0x800106ba and fails to start. It can’t be un-installed or re-installed. But the systems seems to think it is running. … This sucks.

  11. microsoft comments that if you have microsoft security essentials turned on, then automatically windows defender is turned off. When you disable essentials,then try defender. It should work then! I had the same problem, and when I followed this advice I was able to run m.s. defender.

  12. sketch is right…. defender turned on when i disabled security essentials…

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