keelhola
What computer operating system is your Premiere Elements 12 running on? The program requires running from a User Account with Administrative Privileges as well as the installation of QuickTime which also has this Administrator requirement.
McAfee has been known to conflict with Premiere Elements (many versions).
I would encourage you first to contact McAfee for guidance in writing permissions and other relating to your specific McAfee activities (antivirus and firewall) in your corporate network.
Have you looked into alternative corporate network security?
ATR