On Windows 7 x64 build 7048 (I know, it's beta, please don't kill me yet), ESS v4 appears to cause a BSOD with tcpip.sys. I'm not the only one with this problem, see here: http://www.neowin.net/forum/index.php?showtopic=733800&pid=590568710&st=0&#entry590568710 There's about 4 other people using various builds that can confirm the problem. Seeing as how there are many problems so far with the firewall I figure it's better to report it now (even if I'm using a BETA OS... I'm not demanding a refund or anything, OK? ) since MS is very close to the RC build. This is with 4.0.314 by the way.