Unable to attach database using Management Studio

 
Hi,  I have installed SQL Express 2008 on a Windows XP SP2 box. SQL Server 2005 is also on this box (installed as part of another program).
 
When I try to attach a database using Management Studio I get the following error:
 
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Cannot show requested dialog.
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Parameter name: nColIndexActual value was -1. (Microsoft.SqlServer.GridControl)
------------------------------Program Location:
   at Microsoft.SqlServer.Management.UI.Grid.GridControl.SetColumnWidthInternal(Int32 nColIndex, GridColumnWidthType widthType, Int32 nWidth)   at Microsoft.Sq ...