You should be able to install your McAfee Protection from this Link: http://www.cox.net/
As for your Email Account, the Technician from your ISP generally sets that up during installation.
If you have had any previous Security Applications installed, they need to be removed first. If you need further instructions on how to install your McAfee;How to uninstall or re-install supported McAfee products using the Consumer Products Removal tool
All the Best
McAfee Community Moderator