I have sp2 installed on 2 of my 3 machines(the 3rd 1 crashed the system) the new firewall is awsome. Th 1st time you run AH it will prompt you for permission, from then on you can run AH without any problems, You can even host H2H with the firewall on. DX9.0c shows an old file error but works just fine, I'm sure that will be fixed for the final relese.