cognos 10.1.1 for excel connection issues

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Hi friends ,

Few Users are facing issue with accessing cognos10.1.1 from Excel.I have installed in my machine  and its works fine for me.
User can able to the see the public folders also  in excel but when  user  expanding the public folder  its keep on loading  and it never go the inside folders.However user can  able to access the cognos through web  with out any issues. So  user  is having  issue  only  with excle  connect.We have reinstalled IBM Cognos for Microsoft Office  multiple times and every time  after expands the public folder/Myfolders  its keep on loading.
We are using Windows IIS 7.is there  any special settings we need to do for  cognos excel connect. We have enable the Plugins /COM-Adds
Attached screenshots  are FYR.Do we need to do any special settings in ISS to work  excel with cognos ?  Please help