First, you should never, and rarely can, have two or more AV programs running at the same time. That can cause conflicts between the two should both lock onto the same file at the same time, or should they detect each other as a problem. (The one was disabled to prevent problems from arising.) Thus, you need to choose one for realtime protection and leave the other disabled or uninstalled until you need it. (At which time you'll have to make a swap...disable one and enable the other.)
Second, Windows Security does not detect all antivirus and firewall software, so there isn't necessarily a problem there.
Finally, there should be an option in the program's setting/preferences that allows you to have it run at startup/boot. You can also go start->run, type in msconfig and enable/disable the program's loading at startup by checking/unchecking the program's service(s). (Check the list for references to the two programs.)
Hope this helps,
i have both antiVir and Avast installed but at startup at get this dialogue bos telling me Avast is disabled due to incompatibility with AntiVir. i have automatic update set up for AntiVir but Windows security tells me that my antivirus is not on. now i am thinking i should disable AntiVir so Avast can run, but it's not at my startup menu. how am i supposed to do this?