vb.net policyexceptions

I have loaded my exe files to a server. In the past, I have been able to "run" the exe file from the server and not download to a local machine. After switching to vb.net, I get the following error when trying to run from the server
System.Security.policy.policyexception
Execute permission not acquired.

The exe file runs fine if downloaded first and then run from a local machine.

Since the server has not changed, I am assuming I have to make changes in the system security class of vb.net. Can anyone give me some help in what I need to add to the code to make this work.

Thanks