Windows Defender is legitimate and can be used with McAfee?

I never noticed before Windows Defender and do not download it.  So I wonder if my copy is legitimate or harmful.  And I use McAfee antivirus.  If it is legitimate, do I use it with McAfee?

I noticed in the Panel of the icon next to the time in the lower right corner, but it has now disappeared.  It was a symbol of an exclamation mark, then he had a rotating blue circle saying it was scanning after that I started the scan McAfee because I was not familiar with Windows Defender.  But he finished what he was doing and it has now disappeared.  I just wanted to know if it was true or harmful, and if there was all I had to do about it.

Thank you!

If you use Vista, Windows Defender is part of the system. It comes with it. It can not be uninstalled either.
operating
McAfee has his own defender and run 2 defenders in the same machine allows to create conflicts. McAfee is supposed to close Windows Defender.
That should explain what you saw, i.e. exclamation mark and others.

It is ok. You have no problem in this regard.

For the benefits of others looking for answers, please mark as answer suggestion if it solves your problem.

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