Getting your .NET 4.0 site to work with II6

Having trouble getting your ASP.NET 4.0 site to work while using IIS 6?

I recently encountered the same problem, but was able to get it working by enabling the dll for the .NET 4 ASP.NET ISAPI extension.

Johan Driessen has put together a great tutorial on how to do this:
http://johan.driessen.se/archive/2010/04/13/getting-an-asp.net-4-application-to-work-on-iis6.aspx