desktop, welcome to the forum! As the other members have already stated, and you've already found out, MSE is really good. I was a Avast user myself, still am with Win 2K. A really good backup scanner that doesn't use resources, unless you are manually scanning it, is Malwarebytes. It's free and effective against malware.
I hope that you enjoy the forum, and find it a great place to learn.
Cat