I have avast and malwarebytes antimalware premium too and it works just fine as long as you turn on real-time protection you'll be fine. But did you buy for avast? Because avast free is almost just as good as the paid products. Personally i don't want to put some extra money into an antivirus that isn't as good as free ones. And avira is good, some say it's better than avast but it has low detection rates on some tests and high detection rates on other tests so it's really confusing, but to be honest avast has an outstanding detection rate, amazing interface, stunning signatures and fabulous behavioural blockers. All you need now is a firewall and a sandbox if you want one. If you have any questions feel free to ask.