Vista has many issues with the SFC games..
You will have to configure Vista to work with your software.
To start off with, Vista has many issues in compatibility with older OS systems... so using the Vista Beta RC SP 1 would help a lot, however you download at your own risk, no one here is responsible for what you put on your system.
the SP 1 Beta for vista can be located at
http://www.microsoft.com/downloads/details.aspx?familyid=BE34577A-E925-48FB-9D6D-50FE9461F808&displaylang=enIt takes about 1 hour to install
You will also need to go to Windows Update and get any additional (optional and Security) updates available.
Then you need to disable the Windows Firewall Service.. to do this you need to click on the start button, click on run, type in Services.msc, scroll down to Windows Firewall , right click on it, select properties, click stop button, and change the dropdown menu from automatic to disable.
Next you need to disable user accounts. go to control panel, go into user accounts, click on user accounts, click on turn on/off user account control, uncheck box, click OK. This disables Vista making a SHADOW copy of your account.
Next configure your Anti-Virus / router firewalls (you should only be using 1) according to the Networking Readme file located in the SFC 3 game directory
Now, you need to configure GSA to work with Vista.. to do this, set GSA compatibility mode to Win 2000 and disable Desktop Composition, Disable Visual themes. GSA should work normally now.
Next you need to configure the game, Set game for XPSP 2 compatibility, disable Visual Themes, and disable desktop composition.
Now when you launch the game and go into Multi-player, you may get a firewall message.. just exit the game and re-launch.. you should now see the directory servers.. however servers may not seem to work correctly for players on Vista.. such as slow hex movement, purchase components not updating for 1 to 2 min, hex update after battle not updating for 1 to 2 min.. these things work just fine for people using XP, however Vista is using a different Direct X version than Vista. XP is using Direct X 9.0c, Vista SP 1 uses Direct X 10.1, there is a compatibility problem between the Direct Play controls in the Direct X version that cause this problem with Vista users and SFC games.
Microsoft is working on compatibility between the 2 OS systems in Direct X.. hopefully the upcoming XP Direct X version 9.0LE will be compatible with Vista Direct X 10.1...
However the main problem is that no one has the source code for SFC 3 or SFC OP, both games suffer the same problem.. a rebuild of the game engine under the Direct X 10.1 SDK should fix the networking issues, however, no one has a source code and as such, no update can be made on our end.. so we are waiting on Microsoft.
Hope that this helps.