"Could not load file or assembly..." DotNetOpenAuth + MVC3

I'm getting the following error ``` Could not load file or assembly 'file:///C:\Users\<project path>\bin\DotNetOpenAuth.dll' or one of it's dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) ``` I get this when I try to add a Controller to my Controllers folder within the MVC3 framework. I've only recently started using MVC3 and DotNetOpenAuth, I've been using a tutorial to try to learn it, the part I am replicating is this: http://www.asp.net/mvc/tutorials/getting-started-with-aspnet-mvc3/cs/adding-a-model I can still run the project and everything works fine, I simply cannot add Controllers. I'm using VS .NET 2010 (64 bit) on Windows 7. Let me know if there's any additional information that is needed, thank you in advance!