Can anyone please help me with this query??

I am trying to use the permview.exe utility in command prompt to view the security permissions of an assembly. However, when I use the following command 'Permview InternationalSales.dll' I get the error message 'unable to view permission requests from assembly'.

I have tried using a strong name with the assembly and have even tried adding the assembly to the Global cache, but still get the same error message. I am currently using windows XP.

Any help would be great.