If it doesn't run with the standard Windows firewall, just switch to another antivirus or nternet security solution. Use the uninstall program from McAfee's site to fully uninstall it.
Are you sure you talked to the legitimate customer service from McAfee and not one those fake support sites that spam themselves so much, but whose only purpose is to get your money or, even worse, install malware while you give them access to your system.
I've recently tried to activate a new subscription to McAfee and in doing so raised an Error message. I rang the support helpline, and was told by the guy that I needed to have a Network Firewall to enable this to work..... but if I paid another £89.99 I could have a full subscription including a Network Firewall... apparently my BT internet provider does not include one in the package I have. Is this correct? I got the feeling that I was just being fleeced for more money and ended the call....but my subscription is fast running out and am unsure what to do! Any help much appreciated by a relatively novice user!!