title: Unable to start program 'http://localhost/Default.aspx'. VS2010
body: <p>I cannot start my website from Visual Studio 2010 anymore.</p>
  
  <p>For a few days I cannot start my project in a web browser using F5. When I open my web application directly by typing the same url '<a href="http://localhost/Default.aspx" rel="nofollow">http://localhost/Default.aspx</a>' everthing works fine.</p>
  
  <p>When I run the project (F5) a new webbrowser starts, but after a few seconds it is stuck and Visual Studio gives an error dialog:</p>
  
  <hr>
  
  <p><em>Microsoft Visual Studio</em></p>
  
  <p><em>Unable to start program '<a href="http://localhost/Default.aspx" rel="nofollow">http://localhost/Default.aspx</a>'.</em></p>
  
  <p><em>OK</em>   </p>
  
  <hr>
  
  <p>When I run the project in release mode it gives an extra error:</p>
  
  <hr>
  
  <p><em>Microsoft Visual Studio</em></p>
  
  <p><em>The following module was built either with optimizations enabled or without debug information:</em></p>
  
  <p>C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\6552bec6\694bce32\assembly\dl3\8c9bd8d8\fb1d75cb_af26cc01\[name].Presentation.DLL</p>
  
  <p><em>To debug this module, change its project build configuration to Debug mode. To suppress this message, disable the 'Warn if no user code on launch' debugger option.</em></p>
  
  <p><em>OK</em></p>
  
  <hr>
  
  <p>I have already repaired, removed and reinstalled Visual Studio 2010, I've tried using different browsers (including Chrome and Firefox), used different aspnet_regiis.exe options, etc. etc.</p>
  
  <p>Nothing helps, and yeah now I'm stuck pulling hair out of my head ...</p>
  
  <p>Anyone any idea how to solve this?</p>