Yes.
remove either avast or Microsoft security essentials (I'd suggest removing avast personally)
malwarebytes only runs when you ask it to, it doesn't run in the background so you can keep that and manually scan every now and then.
The windows firewall is better than nothing, but it's not the best about as it is typically only a one way firewall (it will stop nasty things coming into your computer, it won't stop unauthorised things being sent out from your computer) there are better about for free such as zone alarms free firewall.