if firewall is installed the default settings at the time of installation is optimum settings. if cis is installed than due to cav the settings are different. like in optimum settings image execution is normal while in cis settings image execution is disabled. few changes in defence plus - monitor settings too. like more things selected in monitor settings in optimum settings while few things selected in monitor settings in cis settings. so can i have comodo internet security settings enabled and avira antivirus free instead of comodo antivirus.