I just started with ASP.NET in VB.NET. I had developed a simple web page and it worked fine. Then I installed web matrix and started playing with it. When I go back to VB and try to run the program (that worked before) I get an error: "Unable to start debugging on the web server. Could not start ASP.NET or ATL server debugging."
How do I get VB.NET to working again?
I'm not sure why your existing Web application don't work after the installation of Web Matrix, as they can live without conflict in fact, did you try to look for an answer from the support.microsoft.com about the configuration or debugging ability of your account?