.NET in Excel 2003
 

I working with vb.net 2005. I created a Class Library project and add a COM
Class to the project. I set COM interoperability, and COM visibility of the
project.
Also I set a strong name of assembly.
I compile all in a dll file.
Now, if I refer it in Excel 2003 VBA macro I view method and properties
correctly, but if I run the macro, VBA say me that dll class not found.
Why?