Help!

I'm starting a small application.  The code is in a network folder, the same
place as the Excel file it will access.  When I tried a simple test run, that
basically does very little, I get:

The customization assembly could not be found or could not be loaded.

I went through a bunch of stuff to try to fix this:  Using the .net
configuration tool to do something with msosec.dll.  I'm not sure this was
the appropriate documentation.  I also looked at Updating Security Policy in
help -- this was very hard for me to follow and didn't work.

Can anyone point me to documentation on this or suggest something?  For what
it's worth, I can get permissions to go anywhere I need to.

        Art