I assume you did not have another firewall program install previously or currently? If you did you need to run its uninstall tool.
Set firewall to defaults reboot and see if that helps
That said if that is not the issue maybe the install got corrupted and a uninstall / reinstall would clean it.
reboot and run
reinstall Mcafee from your account
Ahhhhhhh! It works! Thank you!!!!
Which of the above worked. This for my info
reinstalling. i couldn't restore firewall's default settings because well, it was under firewall settings and i couldn't get to that because McAfee would freeze right after. uninstalling then reinstalling fixed it thank you!
Glad to help that fixes many issues