If you have Windows defender and windows firewall you don't really need Zonealarm. Your Avast is doing 95% of your protection and those other 2 will do the rest and you also have proberly a firewall on your DSL router as well.
The fact you are running in a none admin account is worth far more in security than any other feature on your machine.
Having to many devices scanning everything can slow your system down to a snails pace as well.
I will bow to the others though as this windows7 machine is the first decent windows OS I have played with since NT4. All I have got on it is avast and windows firewall and Defender.
I am running it in a normal user account though not the one which the installation though I should use. WHich I think is half the problem people follow the instructions and it leaves them in a admin account. If it rebooted like a linux OS forcing you into a normal user account it would save folk a heap of problems