Using 2 different antivirus programs will cause you issues so you need to make a decision as to which one you want to use in the future. If you choose to use the other program then you will need to uninstall McAfee and run the MCPR removal tool also.
McAfee is designed to run with the various services it needs upon startup so if one should attempt to adjust any of the settings you may mess something else up in the registry that will cause you issues with your computer.
I realize this is not necessarily the answer you want but I just wanted to point this out for you.
When You uninstall you can reinstall choosing custom install and leave out the AV component. This assumes your AV you want to keep has no firewall anti spam etc. Was this what u were after?
I can though see issues as the developers would not have heavily tested this path with all Avs and yours might clash.