title: Xamarin Installation issue
body: <p>I'm trying to install Xamarin for Android and I'm having a some issue and I can't find any help anywhere. Even, I have tried to run installation as Administrator but same error keep appearing : <br />
  This is the Log File <code>Error Part</code>: </p>
  
  <pre><code>[2013-04-10 23:20:27.396] [Info] Installing an MSI
  [2013-04-10 23:20:27.400] [Info] Database path: &lt;USER_HOME&gt;\Temp\Xamarin\downloads\mono-android-4.6.02001.msi
  [2013-04-10 23:20:27.404] [Info] Starting MSI installation: msiexec /i "&lt;USER_HOME&gt;\Temp\Xamarin\downloads\mono-android-4.6.02001.msi" /quiet /passive /log "&lt;USER_HOME&gt;\Temp\tmp76AB.tmp" ADDLOCAL=MonoDroidSDK,VisualStudioAddin,VisualStudio11Addin
  [2013-04-10 23:20:27.608] [Info] MSI installation process exited with code 1620
  [2013-04-10 23:20:27.611] [Info] Status: failed.
  [2013-04-10 23:20:27.615] [Info] InstallMsi failed for '&lt;USER_HOME&gt;\Temp\Xamarin\downloads\mono-android-4.6.02001.msi'
  [2013-04-10 23:20:27.618] [Exception] Exception was thrown.
  [2013-04-10 23:20:27.618] [Exception] System.InvalidOperationException: MSI execution failed.
  [2013-04-10 23:20:27.618] [Exception] à Xamarin.Web.Installer.WindowsInstallationArchiveHandler.InstallMsi(String file, Boolean needsPrivileges)
  [2013-04-10 23:20:27.621] [Info] BEGIN &gt;&gt;&gt;&gt;&gt;&gt; msiexec log: '&lt;USER_HOME&gt;\Temp\tmp76AB.tmp'
  [2013-04-10 23:20:27.626] [Info] END &gt;&gt;&gt;&gt;&gt;&gt; msiexec log: '&lt;USER_HOME&gt;\Temp\tmp76AB.tmp'
  [2013-04-10 23:20:27.629] [Info] Status: failed.
  [2013-04-10 23:20:27.632] [Exception] Installation of software item 'Xamarin.Android for Visual Studio and Xamarin Studio' failed with exception.
  [2013-04-10 23:20:27.632] [Exception] Xamarin.Web.Installer.InstallException: Installation of archive '&lt;USER_HOME&gt;\Temp\Xamarin\downloads\mono-android-4.6.02001.msi' failed with exception. ---&gt; System.InvalidOperationException: MSI execution failed.
  [2013-04-10 23:20:27.632] [Exception] à Xamarin.Web.Installer.WindowsInstallationArchiveHandler.InstallMsi(String file, Boolean needsPrivileges)
  [2013-04-10 23:20:27.632] [Exception] à Xamarin.Web.Installer.Installer.InstallationArchiveHandler.Install(String path, Boolean needsPrivileges)
  [2013-04-10 23:20:27.632] [Exception] --- Fin de la trace de la pile d'exception interne ---
  [2013-04-10 23:20:27.632] [Exception] à Xamarin.Web.Installer.Installer.InstallationArchiveHandler.Install(String path, Boolean needsPrivileges)
  [2013-04-10 23:20:27.632] [Exception] à Xamarin.Web.Installer.Installer.BaseSoftwareItem.Install(UInt32 tryNumber)
  [2013-04-10 23:20:27.632] [Exception] à WindowsInstaller.ProgressPage.InstallationWorker()
  [2013-04-10 23:20:27.635] [Info] Status: failed.
  [2013-04-10 23:20:27.638] [Debug] Starting installation complete task.
  [2013-04-10 23:20:27.641] [Info] Background installation worker completed.
  [2013-04-10 23:20:27.644] [Info] Installation completed with failure
  [2013-04-10 23:20:27.647] [Info] Status: failed.
  </code></pre>