after uninstall of your product , did you check whether your COM+ Services are still left over in the below path Control Panel\System and Security\Administrative Tools\Component Services \Console Root\Component Services\Computers\My Computer\COM+ Applications if your COM+ services are still left over here then this is dll files un-registration issue , COM+ dlls needs to be unregistered properly. I am not sure but seems like this is dlls un-register issue. another precaution is that you need to check in services manager about corresponding service name before unregister the COM+ service. regards, Phanik ... View more