title: System.BadImageFormatException while using NUnit and Resharper
body: <p>I am using Visual Studio 2010 and Resharper 9.0. I have 64 bit system.
  I have NUnit 2.6.4</p>
  
  <p>I get this when I try to run any test. No tests work here.
  Can anyone please tell how to solve this error.</p>
  
  <p>Error:</p>
  
  <pre><code>System.BadImageFormatException : Could not load file or assembly 'NUnitFirst, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.
  </code></pre>