Dempsey,
I don't know who you are, but you are the MAN!!! I pretty much followed Michael's instructions, had problems, and then followed the directions in you posted and it came up like a champ.
Some notes on how I did it (timing):
1. Editted the install.aspx.vb with your suggestions. Then I got the same error as before.
2. So I looked in the \Config\BackupNNNNNN, and saw the web_.config file. So I saved my old web.config file (in the root), and moved this file to the root, renamed as web.config.
3. Invoked the site URL again, and - presto! - DNN started installing. At the end, I clicked on the link to Access the portal and got one other error. Couldn't find my SiteURLS.config file - it was looking for it in the root. So I moved that from the \Cpnfig file to see if that would fix the problem, and it did!
Thanks for all your tips, Michael and Dempsey.
Pam