Can not debug project. Error message: Unable to start debugging on the web server.

Here is the complete error message:

Unable to start debugging on the web server. The web server is not configured correctly. See common help for configuration errors. Running the page outside of the debugger may provide further information.

This is an old VS 2003 ASP.Net C# project that I moved over to a new machine with VS 2005. Any suggestions on how to start this project in debug mode?
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gtrappConnect With a Mentor Author Commented:
This is a new VS 2005 install. .Net 2.0 is selected in IIS. I just copied the project files over from the PC that had VS 2003. What I could do is create a new blank VS 2005 project and then just copy the code over. its a small application.
Did you upgrade the project ot VS 2005?  If not, did you install VS 2003  after you installed VS 2005?  If so,   they don't play well if not installed in the correct order.   This may have jacked up iis.   Do the 2005 projects debug and work fine?    If you go into IIS into a project properties do you have the option to set the virtual directory to use 1.1 or 2.0?  Make sure that your project is set to 1.1 if you are still using 2003
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