title: Nuget-update won't install because of access denied error
body: <p>I'm using VS2012 under Windows7 64 bit. Now there is an update for the Nuget package manager within Visual Studio that I can't install, neither from the update mechanism within VS itself, nor when I download the latest Nuget version as a VSIX and try to install it manually.</p>
  
  <p>The error message is localized, but in basically says something like:</p>
  
  <pre><code>Access denied; HRESULT 0x80070005 (E_ACCESDENIED)
  </code></pre>
  
  <p>There's also a link to more specific details in that message box that gives the following information (here are only the last lines where the error occurs):</p>
  
  <pre><code>05.05.2014 07:22:27 - Failed to initialize settings for Isolated Shell c:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\ssms.exe: Zugriff verweigert (Ausnahme von HRESULT: 0x80070005 (E_ACCESSDENIED))
  05.05.2014 07:22:27 - Installiertes Produkt gefunden - Microsoft Visual Studio 2010 Professional
  05.05.2014 07:22:27 - System.UnauthorizedAccessException: Zugriff verweigert (Ausnahme von HRESULT: 0x80070005 (E_ACCESSDENIED))
     bei System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
     bei Microsoft.VisualStudio.Settings.ExternalSettingsManager.GetScopePaths(String applicationPath, String suffixOrName, String vsVersion, Boolean isLogged, Boolean isForIsolatedApplication)
     bei Microsoft.VisualStudio.Settings.ExternalSettingsManager.CreateForApplication(String applicationPath)
     bei VSIXInstaller.App.GetExtensionManager(SupportedVSSKU sku)
     bei VSIXInstaller.App.GetExtensionManagerForApplicableSKU(SupportedVSSKU supportedSKU, IInstallableExtension installableExtension, List`1 applicableSKUs)
     bei VSIXInstaller.App.InitializeInstall()
     bei System.Threading.Tasks.Task.InnerInvoke()
     bei System.Threading.Tasks.Task.Execute()
  </code></pre>
  
  <p>As far as I can see, there's a problem with accessing the SQL Server Management Studio executable (<code>ssms.exe</code>). The VSIX installation runs with admin privileges, so I wonder that there is an access problem at all. So I tried to explicitely set file and folder permissions to full rights for everyone, but the error remains.</p>
  
  <p>I'm really surprised this error occurs because in my eyes I don't have a highly customized environment but a rather standard one... don't they test their updates properly before rolling them out?</p>
  
  <p>Any help on resolving this issue is highly appreciated, thanks in advance!</p>