title: unable to load Assembly
body: <p>I'm getting a strange error from my VisualStudio 2008 installation in Windows 7 and I wonder whether anyone knows how to fix that:</p>
  
  <blockquote>
    <p>Unable to read the project file
    "cs.proj". Could not load file or
    assembly Microsoft.Build.Engine,
    Version=3.5.0.0, Culture=neutral,
    [...] System cannot find the file
    specified.
    `</p>
  </blockquote>
  
  <p>I checked: .Net 3.5 is installed. So does anyone know what that means?</p>
  
  <p>Thanks ;)</p>