I have an ASP.net application that uses authentication that was working great with SQL Express 2005 and I tried upgrading to 2008.  I uninstalled SQL 2005 and installed SQL 2008 and now I get the error below:

I tried deleting the directory

:\Documents and Settings\username\Local Settings\Application Data\Microsoft\Microsoft SQL Server Data\SQLEXPRESS directory, but that did not help.

Server Error in '/Admin' Application.

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Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed.

Thank you for not trying to start an argument.