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
If the system returns “WMI repository is not consistent”, run this command
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
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.
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.
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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