Installation .NET Framework 3.5 continues to fail with a 80070026 RRS feed

  • Question

  • User-1508008247 posted


    I'v been trying in vain to install the .NET Framework 3.5, the installation fails with the message "80070026".


    I do have a Windows Vista Business SP1, Visual Studio 2005, using .net framework 2.0 and the ajax extensions toolkit.

    Also the .NET Framework 3.5 is installed.


    After the installation failure, I've been looking in the knowledgebase and on the web, and tried several suggested possibilities.

    I've deinstalled the 3.5, used the windows cleanup tool, reinstalled the 3.5, that's ok. But still the 3.5 SP1 does not want to install with this.

    Somewhere Microsoft also suggests to change the name of the DownloadSoftware map, de-install 3.5, clean-up, reinstall. But all in vain, it's not working.


    I really do not know what to do anymore ???



    Tuesday, September 8, 2009 4:04 AM


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