MalwareBytes Free is a good addition as long as you update it before each scan.
If you want to purchase a license do before MBAM v2.0 is released.
Now is a lifetime use with real-time protection. After v2.0 release it will
be an annual fee.
If you choose to use Comodo Firewall may I suggest you use v5.12 since v6.x.xxx seems to be bloated.
CFW v5.12 is lighter than v6.x.xxx If you decide on Comodo Firewall “disable” the “behavior blocker” as it will create a conflict with avast.
Download CFW v5.12 from here.
Easy to follow instructions to install any version of CFW can be found here.