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  • Question

  • always get error code:0x800Fo81F when tryng to turn on the .NET Framework 3.5 feature from the control panel

    ?pls any help?


    • Edited by hanson2000 Monday, March 13, 2017 1:22 AM
    Monday, March 13, 2017 1:13 AM

All replies

  • Hi hanson,

    Thank you for posting in MSDN forum.

    Is your OS Win 10?

    For Win 10, please open a command prompt (cmd.exe) as admin and run the following command to install .Net 3.5:
    DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:d:\sources\sxs /All /LimitAccess

    (replace D: with your mounted Win10 ISO)

    In some environment, DISM fails to fetch the file (Proxy, network policies). The DISM command takes the files from the DVD and you're fine.

    If you are MSDN subscriber you can also download the Windows 10 Features on Demand ISO, mount the ISO, copy the Microsoft-Windows-NetFx3-OnDemand-Package.cab to C:\Features (or a different folder) and those commands:
    DISM.EXE /Online /Add-Capability /CapabilityName:NetFx3~~~~ /Source:C:\Features

    If this fails, run this:
    DISM.EXE /Online /Add-Package /PackagePath:C:\Features\Microsoft-Windows-NetFx3-OnDemand-Pac

    Best Regards,


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    Tuesday, March 14, 2017 5:29 AM
    Moderator