title: Intellisense and error highlighting not working by default in VS2012
body: <p>I've recently bought a new computer and as such have had to install visual studio 2012 onto it. When I installed it onto my last computer, everything worked fine by default; this time, auto-completion is off/not working and neither is error highlighting.</p>
  
  <p>I've tried resetting the settings to their <a href="http://blog.jongallant.com/2012/07/intellisense-visual-studio-2012.html" rel="nofollow">defaults</a> but this has had no effect. </p>
  
  <p>What else can I try? </p>
  
  <p>Thanks.</p>