IIS 5.1 server debugging (asp.net)

Help!!!
I have IIS 5.1 installed and when I try to run an ASP.net code, it pops up with an error that says that the server cannot start debugging on the server. I have the server components installed in .net and the front page extensions installed in iis5.1. Am I missing something simple?

An ASP.Net application can only run on a computer that has the .Net Common Language Runtime installed.
ASP.Net also doesn't require IIS 5.1 you can actually run it on IIS 4.0 or some other webserver as long as the CLR is installed.