Iv'e had McAfee before, it was good, but maybe too good sometimes if you know what i mean? I had my time trying to let files, programs trough the firewall, but i managed to do it somehow. If i remember good enough you double click the icon in the right down corner, or manually open McAfee security center. Look for options or configure, open advanced tab or Internet and network tab. One of them should be there, and there you would see disable firewall,
I also did a quick google search and found this
You must login or register to view this content. , It's very similar to what i told, but with better english