Yeah, it works Both ways work: either running it windowed as you described, or going to the settings of the firewall and allowing everything for defcon beforehand

Ahh.. I also use the Comodo Firewall, that might be the problem. I'll try to allow everything before starting later when I have time.

I have exactly the same problem. Bought the package over Steam and Defcon freezes with a black screen. I also use Windows 7 with 64 bit, however I have an Intel Core Duo E6300 and an Nvidia GeForce 9800 GT. Direct X Drivers are updated, however I use an old nvidia drivers version because else Neverw...