title: MVC3 Re-installation VS2010 SP1
body: <p>I've looked <a href="http://VS10-KB2483190-x86.exe%29%20failed%20with%200x80070643%20-%20Fatal%20error%20during%20installation.%20." rel="noreferrer">here</a> and the <a href="http://blog.mjjames.co.uk/2010/12/mvc-3-rc2-install-error-0x80070643.html" rel="noreferrer">link in the solution</a> but I'm still having problems.  I had Visual Studio 2010 with SP1 beta and MVC3 installed but encountered no Intellisense on cshtml files and problems with System.Web.Helpers not being found.</p>
  
  <p>Downloaded the released VS2010 SP1 and installed this (as recommended, over the beta) and still had the issue so uninstalled MVC3.</p>
  
  <p>Now I can't install MVC3 at all, the log shows VS10-KB2483190-x86.exe) failed with 0x80070643 - Fatal error during installation and even when opening the MVC3 exe in 7-zip and installing components individually as per the blog.</p>
  
  <p>Has anyone else had a similar problem that they manage to solve?</p>