You can turn off the pop ups in avast.......
You might think Defender is great but every independent lab rates it sub-par, faaaaaar below Avast and AVG. Are you sure you don't have stock in Microsoft?
If I thought it was great, I would have said it is great - which I didn't.
My real world experience is that some very nasty malware has danced right past Avast and AVG, while stopped by Security Essentials. IF you run Defender alone on a Windows 7 machine, you have no AV at all.
I don't have stock in Microsoft, but I have been in IT for 35 years, in the trenches with thousands of machines. It isn't a game for me, it isn't a hobby. I use what is most effective. Which in my case is ESET with a dedicated server pushing definition files and isolating IP's of any suspicious packets. However, the question was about home use. In my experience, which is considerable, Essentials provides reasonable protection for those who do not frequent porn and Wares sites.