"system scan is recommended" - What is this?

This image has started appearing on my computer when I start it up, and I've never seen it before. Obviously I don't want to have it scan not knowing what this is... any ideas if this is real or some kind of problem? I have an Macbook Pro. TIA.


https://discussions.apple.com/thread/6905066


Thank you Rob! That seems to have worked.



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