Asp.net-mvc – How to make ASP.NET MVC work in IIS 6

asp.net-mvciis-6windows-server-2003

I have installed .NET Framework 3.5 SP1 and ASP.NET MVC CTP in a Windows Server 2003 R2 box, but my ASP.NET MVC site still doesn't work on that server. I was searching the internet and IIS for a solution and I noted that I can't choose other .NET Framework version besides 2.0 for my virtual directories. I'm almost sure if I correct this I can make my site work there.

Currently the main "/" URL answers with:

Directory Listing Denied
This Virtual Directory does not allow contents to be listed.

And the "/Default.aspx" URL answers with:

Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
Parser Error Message: Section or group name 'system.web.extensions' is already defined. 

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