"Cannot open an anonymous level security token" - When I try to enable .NET Framework 3.5.1 RRS feed

  • Question

  • Hi!

    When I try to enable .NET 3.5.1 I get this error message. Windows Updates are failing too with the same error 80070543. Any help?

    I'm loving Windows 8 Developer Preview running in my laptop, but I'm having this small trouble and maybe I'll need to reinstall Windows 7.

    Thank you a lot for the attention!

    Best regards,


    Friday, October 14, 2011 10:50 AM


  • Hi Cesar,

    First thing I would recommend is performing a Refresh PC operation which will reload Windows without losing your data.  You will have to reinstall any applications that you've added after the refresh.  You can find the Refesh PC option in the Control Panel >> General.  Click on Get started under Refresh PC and follow the prompts.  Once that's done try .NET 3.5.1 again and reply with results.

    Here is what will happen when you refresh your PC:

    • Your files and personalization settings won't change.
    • Your PC settings will be restored to their defaults.
    • Apps from Windows Store will be kept. All other apps will be removed.


    Saturday, October 15, 2011 8:30 PM