Avast and Windows Defender Question

I am not certain if I am posting this in the right spot, please tell me if I am wrong. I am running Windows 7 with Avast free and free Malwarebytes. I uninstalled Microsoft Security Essential when I got Avast. I didn’t get rid of Windows defender because it never did anything without permission but today I noticed it scanning my computer after a recent windows update. I don’t still need this tool do I? This won’t disable my firewall correct?
Sorry for all the noobie questions.

  1. No, you can disable it.
  2. That’s correct.

Great thank you!

You’re welcome.