Hey guy... I used to have the same problem but I have had 0 DCs since.

I used to DC 300002 right when I logged in and randomly during gameplay. I thought for sure it was the game or my setup. I too did all the firewall, port, virus scan yada yada and nothing worked.

Out of frustration... I went out and picked up the best NETGEAR wireless router I could find and BOOM... not a single drop... EVER.

Initial setup: Wireless G into Cable Broadband with 2% packet loss as reported by pingtest.net and my lappy tweaked beyond belief.

Current setup: New wireless N into cable broadband with 0% packet loss and running ALL services, firewall, anti-virus, no port forwarding so essentially... default install. I didn't have to do anything to Windows at all...

In the end it was my crappy wireless router. No joke... I used to DC so much It was embarrassing.