If you are reinstalling Microsoft SQL Server 2005 Express on a server running ASP.NET and Plesk, when you try to view an ASP.NET web page, you might see a message like the following:

Cannot open database "TellUWhen" requested by the login. The login failed.Login failed for user 'MIGHTYMOUSE\IWAM_plesk(default)'.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.Data.SqlClient.SqlException: Cannot open database "TellUWhen" requested by the login. The login failed.Login failed for user 'MIGHTYMOUSE\IWAM_plesk(default)'. The basic solution to the problem is to make sure that the specified user name (e.g. ASPNET or IWAM_plesk(default)) is a member of the SQLServer2005MSSQLUser$server$SQLExpress group.Here are the specific steps to do this for the user "" on "":

Right-click "My Computer" and choose "Manage". Navigate to "Local Users...