Simple answer:

http://www.screencast-o-matic.com/screenshots/u/Lh/1369422362613-12070.png

http://www.screencast-o-matic.com/screenshots/u/Lh/1369422229359-61401.png

Just use the search function for defender and open the app to show you the results.
(I didn’t manually disable Defender when I installed avast! on Windows 8 Pro.)