Here's another thing to keep in mind if you run into this error: "Invalid object name 'dbo.dashCommerce_Core_ConfigurationData'". I wanted to test the installation to see if I could help out, so I created a new empty database and then attempted to run the install.aspx, and lo and behold I got the "Invalid object name 'dbo.dashCommerce_Core_ConfigurationData'" error. The problem was that I had the Exceptions (in VS 2008) setup to break on any Common Language Runtime Exception that was thrown. This was because I was debugging another application and left this setting turned on.
To check your settings, or to turn this off, go to the Debug - Exceptions menu in VS IDE, and then uncheck the "Thrown" checkbox next to "Common Language Runtime Exceptions". I believe that is the only way that you will get this error about the "invalid object name". I hope this post helps someone in the future.
Tim