Setting up .NET v1.1 App on VISTA RC1 (b 5536)

I have spent almost 2 days figuring out a way to make my .NET 1.1 ASP.NET
application run on IIS7 on Vista RC1 (b 5536) - in vein.

I get this error message:
__________________________________________________ _________________
Security Exception
Description: The application attempted to perform an operation not allowed
by the security policy. To grant this application the required permission
please contact your system administrator or change the application's trust
level in the configuration file.

Exception Details: System.Security.SecurityException: Security error.

Source Error:

Line 1: <%@ Control Language="c#" AutoEventWireup="false"
Codebehind="ucSideNav.ascx.cs"
__________________________________________________ _________________


I tried several things - few listed below:

* Gave IUSER and ASPNET users GOD rights on both the virtual directory
folder and the framework folder.
* Set the trust level at the application and the site level to FULL
(internal)
* Changed the machine.config for v1.1 to use network user instead of
machine.

Still I can't get rid of the above error.

Can someone please help?

Thanks.

Chandra Sekhar.