title: Running ASP.NET MVC preview 3 apps on a box with the beta installed - how can I remove System.Web.Mvc from the GAC after installing ASP.NET MVC Beta?
body: <p>I have an app built against MVC Preview 3 (referencing local copies of the MVC assemblies)  that I'm trying to modify/test on a machine with the ASP.NET MVC beta installed. I am not interesting in updating this app to run against MVC beta yet - I just need to make a few small changes.</p>
  
  <p>It's failing with MissingMethodExceptions on RouteCollection.IgnoreRoutes (in global.asax.cs) because at runtime, the CLR is always finding the beta version of System.Web.Mvc in the GAC and loading this instead of the preview 3 version in my site's \bin directory.</p>
  
  <p>Since the assemblies have the same name, version and public key, I believe there's no way of distinguishing between them within web.config, so I think the only solution here is to remove the ASP.NET MVC beta assemblies from the GAC.</p>
  
  <p>Only - I can't do this, because they're installed by Windows Installer, so I can't remove them using gacutil.exe /u, and I'm getting "Access is denied" when I try and remove them directly.</p>
  
  <p>Anyone know how I can remove this assembly - or, failing that, how to run/host an app that needs System.Web.Mvc preview 3 on a system that has System.Web.Mvc beta in the GAC?</p>