I don't have time to dip into all the forums I'd like so wasn't aware this topic was around. As the author of the setup tool I feel I should be able to help. I'll get some background out of the way first.
When you install .NET you might only get the MSDE instance of SQL Server if you install the Framework SDK samples. I therefore couldn't automatically default to this, so included the option to specify the server and the instance (Note to self: check what happens if the user doesn't enter an instance - it's been a while since I looked at the code). Anyway I tried to give the most flexible method.
For the two user accounts, the first is the account used to create the samples; this might need to be an admin account within SQL as it creates databases and tables. If you select Windows Authentication then your current windows user needs to have been created in SQL Server as a login and must have appropriate permissions.
The second is the account under which the samples will connect once installed. By default a trusted connection is used, which is the ASPNET account - a local machine account that ASP.NET runs under. This user is machineName\ASPNET, and it is added as a login to the SQL Server and a user to the databases.
If anyone is still having setup problems then I recommend mailing me and I'll do my best to help you with them - put "Wrox Setup Problems" in the title of the message and attach the log file. Go to
http://ipona.com/consultancy.aspx - my email address is displayed there.
Thanks
Dave