That particular setting seems to be in pro only. Doesn't seem necessary, though, since it's built right into the Reliability History . It is somewhat difficult to find. Need to make the Rel His...

I cleaned out the entire event viewer thoroughly (via scripts) before doing this, so that could potentially be important.

Simply "view all events", at the bottom, there is an option to clear.
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I really don't want to spend 40$. I wish I had a .bat that I could schedule like I did for event viewer. Upset that clearing the viewer doesn't also wipe the event monitor history