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Web application unavailable in Visual Studio when run on Vista

I have a web application that I've been working on for the past year in Visual Studio 2005 and more recently in Visual Studio 2008 Team edition.  I recently bought a new laptop which runs Windows Vista Business Edition.  I installed Visual Studio 2008 Team Edition on the machine without a problem.  When I tried to open the solution from Source Control, an error message is displayed that states: System.Runtime.InteropServices.COMException.   The web portion of the soultion does not load, it states that it is unavailable and the project file cannot be loaded.  When I access the web page through IE, it runs fine. The problem is only in Visual Studio. These are the steps that I have taken to try and fix this error.  Keep in mind that this ran fine on XP.

1. I created the virtual directory in IIS 7.0 and converted the virtual directory to a web application.  It is set to run asp.net 2.0
2. I registered ASP.NET 2.0 by executing aspnet_regiis -i
3. I turned off windows firewall
4. Even though my account on this computer is an Administrator, I ran Visual Studio 2008 as the Administrator.
5. I checked to make sure the url in the web vbproj file matches the url that i created on the localhost.
6. I created a new Application Pool, in the classic style.  The application is set to use this new application pool.

It seems to me that this issue has something to do with either the security in Vista or something to do with IIS 7.  

Thanks in advance for your help.
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