This what a mod posted
Kindly follow the below steps to disable McAfee firewall and enable windows firewall.
i)Open McAfee application by clicking on the McAfee icon.
ii)Click on "Firewall" and then select "Turn off".
iii)Click on the Windows icon on the bottom left corner of your computer screen.
iv)Type "Windows Firewall" in the search bar and select "Windows Firewall" from the list of search results.
v)Click on "Turn Windows Firewall on or off" on the left side of the screen.
vi)Select "Turn on Windows Firewall" .
If no go best contact support maybe Win 7 issue thought McFee is now not Win7 proof