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After replacing the default Windows task manager with Sysinternals’ process explorer via the Options → Replace task manager menu, how do you undo that action, i.e. restore the original task manager? I’ve already tried clicking that menu again, but it doesn’t do anything.

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Delete the HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe registry key.

In cmd, you can accomplish this by running (as admin): reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe".

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    the answer is almost perfect, just add that you need to run cmd as admin – kaosmos Jan 29 '19 at 20:11
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    According to the help documentation it's meant to change to "Restore Task Manager" but there must be a bug which doesn't correctly detect which state its in. – Jake Edwards Jul 3 at 1:23
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Don't delete the whole key, just delete the Debugger string value.

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