System.Security.SecurityException: That assembly does not allow

I have created an ActiveX control that does word automation. Once I
creat an instance of work I get the following message
System.Security.SecurityException: That assembly does not allow
partially trusted callers.
I am using .net 2. I have a key and use the regasm tool after it the
dll is compiled
I am really lost on how to make this work any help will be appreciated
JohnDid this work for you?
I have a .NET class that i have made com visible and the client is
trying to access it using Visual Objects over a network shar and is
getting the same exception.
i have added the AllowPartiallyTusterCallers attribute to my
assemblyinfo.cs but is hasnt fixed it.
i have ben trying to test using something non .NET (VB 6.0) but i cant
even reference the tlb or dll but i think that is a VB 6.0 issue.
if anyone has any suggestions pleae let me know.
the Client has advised that the dll works if it is copied locally.
thanks