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Dear Arshad,
we were facing this issue at our customer's place. It is in autocad Structural Detailing 2010 on win 7 32bit. We come to know from the Autodesk site that this ASD 2010 is not supported by Win 7 32bit. Please see link below. You have not mensioned which version of ASD you are using.
http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=14185352
REgards
Mohanzz