title: Windows Phone: Deployment of application to device failed. Exception from HRESULT: 0x89721800
body: <p>I'm developing a windows phone application on Visual Studio 2010, Windows 7 virtual environment.  I've setup Visual Studio to Run as an administrator.  Every time I try to run the windows phone 7 application, it gives me this error:</p>
  
  <p>Windows Phone: Deployment of application to device failed. Exception from HRESULT: 0x89721800</p>
  
  <p>THe only two solutions I found so far are: run as admin (which I am doing) and delete the .user and .suo file (I deleted the project's .user file but didn't see a .suo file anywhere).</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks.</p>