Neither of those will help you on this one - Windows Firewall is not known to log anything of value unless you were already expecting something to happen, and McAfee is completely out of its depths in this case (hint: virus scan, not firewall).
Checking WF logs is done by going into it from the control panel and clicking Advanced settings on the left. From there, Monitoring -> Firewall. However, for it to have recorded anything, it will have had to go at least to your computer. There is at least one item in the way: whichever device handles your network's WAN interface, and as I assume you're on a home/small biz network, that would most likely be your router.
Find the admin panel of that and check its logs. It is bound to have some information on what has been going through. However, until you mention clearly what kind of attack you are being hit with, I can't be more specific than that. An attack may go from anywhere between a script kiddy simply flooding you to a targeted attack tailored on your choice of hardware to anything in between, and any open ports on the router adds to the possible list of suspects.