Windows 7 Game server problem

I want to run a local game server that players could play in... I am talking about LAN server, but when i have server running and things are set so we could take down the game and make it a fight. I find out that they don't see the game at all... HOWever when the server is created on a vista machine ( Windwos Vista home premium 32-bit) i am able to see and join the server. Any ideas why the game isn't shown outside my win 7 I have made configurations to my F-secure firewall so it allows the program and also the Windows firewall has been configured (its turned off but just in case). The router isnät my proble either since all other things work through it.

My system specs
Windows 7 Ultimate x64 (64-bit)
4gb ram
dual core

Also i am using my wireless connection to host it. and it has been confed also.

Does anyone have any ideas what might cause this. Is there somekind of security restriction in windows 7 that prevents it?

bump no replys yet i really need help

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