Permission Denied- COM+

I m having a public not creatable class in my activex control.
I m storing the object of this class in a dictionary object.
I m passing this dictionary object to a VB ActiveX dll i.e loaded under COM+.
When my application is running using SERVER MSI then it works fine.But when i m running this application using client msi i get an error "Permission Denied-Error 70'.
I have unchecked the Enforce Authorization check but the problem still persists.