Mitch - I added BRADS11\ASPNET as a user using SQL Server 2005 Management Studio Express.  I also checked off most of the persmissions.  I detached the database when I was done.

I added Initial Catalog=InstanceDB; as suggested above and got a different, but more promising error:

Unable to open the physical file "F:\DotNetNuke_4\Website\App_Data\Database.mdf". Operating system error 5: "5(Access is denied.)". Could not attach file 'F:\DotNetNuke_4\Website\App_Data\Database.mdf' as database 'InstanceDB'.

I'm running Win/XP Pro SP 2.  It almost looks like a file permissions issue, but unlike Win 2000, when I right click on the .MDF file, I don't have any permissions options.

It did work fine until I opened it up initially with QueryTool, I believe, or it could have been with SQL Server 2005 Management Studio Express - both happened around the same time.

Appreciate your input. Thanks

Here is my error if I use the following connection string:

 <add
      name="SiteSqlServer"
      connectionString="Data Source=.\SQLExpress;Integrated Security=True;Initial Catalog=InstanceDB;User Instance=True;AttachDBFilename=|DataDirectory|Database.mdf;"
      providerName="System.Data.SqlClient" />

======================================

The Assembly Version ( [ASSEMBLYVERSION] ) does not match the Database Version ( [DATABASEVERSION] )

ERROR: Could not connect to database.

Could not open new database 'InstanceDB'. CREATE DATABASE is aborted. Cannot attach the file 'C:\DNN\App_Data\Database.mdf' as database 'InstanceDB'. File activation failure. The physical file name "C:\DotNetNuke_Build\Website\App_Data\Database2_log.ldf" may be incorrect. The log cannot be rebuilt when the primary file is read-only.

Thank You!  What permissions do I need to change?  I'm running Win/XP Pro SP 2.  Are these persmisisons within SQL server or are they file permisison?  Any addtional details you cna provide would be very much appreciated.  Brad