We would like to find a canned program that allows us to host a social
network on our website. We need a package that can run on Windows
Server 2003 written in ASP, C, C#, Visual Basic or .NET. PHP won't
work for us.

I am not interested in a list of all the social networks that exist
but specifically a program that I can install on Windows Server that
would allow people to meet, match interests, share information, plan
meeting and so on.

See prior related question.

http://answers.google.com/answers/threadview?id=589441

The researcher only gave me answers for PHP solutions, I have asked
for a refund which he is aware of since none of these products can be
used.