How to get my Server's Http class code to work in Windows 7

I have a client that can do Http POSTs and a server that can do HttpListener operations
in Windows XP. The existing Http classes from MSDN library for my server don't work in
Windows 7, i.e. HttpListener, HttpListenerRequest, HttpListenerResponse, and
HttpListenerContext. Is anyone familiar with other existing Http classes that work in
Win 7 or patches for my server?

Thanks for any suggestions,


Kent