'Could not load file or assembly' compilation errors

Like many others I am getting the "Could not load file or assembly ... .dll". This problem happens when I try to compile as there is then a single error. I have tried adding a reference to System.Data.Entity and rebuilding, as well as also trying various things out from this stackoverflow answered question:

Could not load file or assembly 'System.Net.Http, Version=2.0.0.0 in MVC4 Web API

I have tried the "Copy Local = True" under properties under References for the particular .dll (It was already set to True), as well as "Always Copy" the .dll in question which is in the bin folder.

I have also tried to find the "runtime" code in the Web.Config file, there however is none in either that or the sub-files (web.debug.config and web.release.config). I thought that perhaps I could modify the version. There are about 10 other .dll references which seem to be working. I also did get the compilation and part of the first page to run the first time, but not after that. Error information is at the bottom.

I have read that there seems to be a problem with NuGet but I don't know if I should remove it as I don't know what it does and might find it useful later. I am using Visual Web Developer Express 2012.

'Could not load file or assembly 'ComponentArt.Web.UI, Version=2008.1.1202.3, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)'   C:\Users\Brian\Desktop

I think you might be using the ComponentArt dll that depends on WebForms in MVC4 project. You need to create a WebForms project and then you will be able to add that DLL.