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MB 3.5.1 causing WMI Provider Host high CPU time?

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This seems to have started maybe 3 months ago. Maybe it happened after an MB update? I don't remember. I have a constant high CPU usage around 9-12% caused by WMI Provider Host. When I go to services (windows 8.1) and go to restart the service, it says that MB (only - no other program) is dependent upon it. Is this high CPU usage caused by MB, and why my browser freezing up for a few seconds every ten seconds or so? Before this started happening my CPU usage was a lot lower and my browser was not freezing.


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I noticed that you are running Avast AV.  There is a known compatibility issue between Malwarebytes and Avast which was resolved in a recent update by Avast which I suspect may not yet be installed on your system (though it may have begun the install process based on some Avast items listed in the Pending File Rename Operations area of your logs which reflect that part of the registry).  First, please try restarting your system to see if the issue is resolved.

Next, I noticed that there is at least one issue with your Malwarebytes installation as the log shows that the registry entries for the right-click "Scan with Malwarebytes" shell extension for Explorer are missing, so it might also be a good idea, once you have restarted your system, to reinstall Malwarebytes.  I'd suggest first attempting to download and install the latest version from here over the top of your existing installation, restarting your system if prompted to do so to complete the installation, then testing to see if the right-click function works for scanning files and folders with Malwarebytes and to see if the performance issue is resolved (assuming it was not already by rebooting the first time to allow Avast to complete its updates).

If the issue still persists after that, or if the right-click scan function is still unavailable for Malwarebytes then please proceed with a clean installation of Malwarebytes:

  1. Run the Malwarebytes Support Tool once more
  2. Accept the EULA if prompted, then click Advanced Options on the main page (not Get Started)
  3. Click the Clean button this time, and allow it to restart your system and then reinstall Malwarebytes, either by allowing the tool to do so when it offers to on restart, or by running the Malwarebytes installer once more that you downloaded in the steps above

If the issue is still unresolved then please force Avast to perform an update by following one of the procedures described in this post, and once it has updated, reboot if prompted then test to see if things have improved.

Please let us know how it goes.


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