First, thank you for your time.
In Windows 7 I just installed Sql Server Management Studio Express 2008. I can successfully connect to the default instance using Windows Authentication. After connecting, when I right click on the "Databases" node a context menu appears. If I select the "Attach" menu item I immediately get an error (btw the error is shown before the Attach dialog appears).
The error I get is "Cannot show requested dialog. Parameter name: nColIndex. Actual value was -1. (Microsoft.SqlServer.GridControl)
Again, thank you for your time.