NuGet upgrade issue

Question

I have the version of NuGet that comes with MVC3 (1.0), but when I try to upgrade to the latest version (currently 1.4) it failes and I get this in the log file:

Answer 1

1. Close all visual studio 2010 instances.
2. Open visual studio again as administrator
3. Go to "Tools" > "Extension Manager"
4. Uninstall NuGet
5. Install NuGet again.

if you are not able to uninstall it go to:

C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\Extensions\Microsoft Corporation\NuGet Package Manager

and remove this folder. deleting this is at your own risk!