More than 50% CPU usage by explorer.exe * 32 in idle state

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  A quicker way to get more information maybe be use Process Explorer from Sysinternals to check the stack of the thread using the most CPU in the explorer.exe process, when you experience the behavior.  When Explorer uses the CPU as you have indicated, double-click the process in Process Explorer and go to the tab of the Threads.  Sort the list of threads by Cycles Delta (descending) and note the thread at the top. Double-click it and discovered its stack. Look for third-party modules (extensions of shell or modules, AV software, etc.) in the stack.  Disable (Autoruns or ShellExView, maybe) / uninstall these components, reboot and see if the behavior is affected.

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  Ok

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  Many times when someone experiences this problem, it may be due to add-ons explore or shell extensions. Consider using Sysinternals Autoruns or ShellExView. Disable Add-ons and non Microsoft shell extensions and verify the behavior.  If he went, reactivate the disabled extensions/add-ons, one at a time and see if you can identify who may be liable.

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  You can use Process Explorer from Sysinternals to check the stack of the thread using the most CPU in the explorer.exe process, when you experience the behavior.  When Explorer uses the CPU as you have indicated, double-click the process in Process Explorer and go to the tab of the Threads.  Sort the list of threads by Cycles Delta (descending) and note the thread at the top. Double-click it and discovered its stack. Look for third-party modules (extensions of shell or modules, AV software, etc.) in the stack.  Disable (Autoruns or ShellExView, maybe) / uninstall these components, reboot and see if the behavior is affected.

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  See the Readme

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