Hi Rahul and Navneet,
this means that you are using a MappingDesigner referring to an Adapter Version 2.1.x.
This version was not released for Windows 7 so I would recommend to use Windows XP
(or install the Windows XP Mode on Windows 7).
The new Adapter-Version 2.2 is shipped with a new Version of the BIC MD that is also running on Windows 7
Kind Regards
Stefan