I'm getting the Red exclamation point and An error has occured. Error: xxxx on all the modules.

<connectionStrings>
    <!-- Connection String for SQL Server 2005 Express
    <add
      name="SiteSqlServer"
      connectionString="Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Database.mdf;"
      providerName="System.Data.SqlClient" /> -->

    <!-- Connection String for SQL Server 2000/2005 -->
    <add
      name="SiteSqlServer"
      connectionString="Server=my_server\my_server_sql_instance;Database=DNN;uid=********;pwd=********;"
      providerName="System.Data.SqlClient" />
  
  </connectionStrings>
  <appSettings>
    <!-- Connection String for SQL Server 2005 Express - kept for backwards compatability - legacy modules   -->
    <add key="SiteSqlServer" value="Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Database.mdf;"/>
    <!-- Connection String for SQL Server 2000/2005 - kept for backwards compatability - legacy modules
    <add key="SiteSqlServer" value="Server=(local);Database=DotNetNuke;uid=;pwd=;"/>
    -->

Are we talking both of the connection strings in the  <connectionStrings>? Or one in each  </connectionStrings>
and <appSettings>?

I have SQL 2000 so it makes sense to me to change the string in both sections of the web.config. I suppose I'll see after changing both sections. I am commenting out the SQL Express areas and un-commenting the SQL 2000. Nope Nothing To Install AT This Time error. Now I did it! Comment out the <appSetting> and leave the single string in <connectionSeting> and DNN all gone "Nothing To Install AT This Time error".  OK how do I get back to where I was?