Limiting exe permissions

[Rene]

I recently finished a C# program that is based on the .Net 1.1 framework and
I am planning to make this program available as a download from the
Internet.

Since the program is something you can download from the Internet and since
most people are afraid of running application from companies they don't know
anything about, I would like to tell my user how to protect them selves from
my own application in case they are concern that my program may have a virus
or some sort of spy ware (it does not but I can't ask them to blindly trust
me).

I tried running the "Trust and Assembly" utility from the ".Net Wizard"
section and set the permission for my application to "None". After doing
that, I was expecting not to be able to run the program but I was still able
to run it.

My question is: What do I need to do to assign a permission to my
application so that it is not be able to browse other directories in my
computer, access the registry, make screenshots etc.

Thanks.