>I have existing sites running DotNetNuke 3.X and would like to upgrade them to the DotNetNuke 4.x code so that they are running under .NET version 2.
>
>Has anyone done this successfully? I've followed steps from the DotNetNuke website, but none work. I end up with either SQL Server errors or "module can't load" errors.

I am still running on 3.2.2 because I'm a bit leery of upgrading. Which version of 3.x are you running? Have you tried upgrading to 3.3.4, then upgrading to 4.x?

Also, are you sure your modules are compatible with 4.x?