Error 0x800F081F when installing .NET 3.5 (Windows 8/8.1)

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windows-8
.net-3.5

2 Answers

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Make sure your device has the latest Windows updates. In particular, update 3005628 fixes problems when installing .NET 3.5.

Source: https://msdn.microsoft.com/library/hh506443.aspx

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Uninstall updates 2966827 and 2966828.

These updates can cause errors when installing .NET 3.5. This problem was fixed by update 3005628.

Source: KB 3005628

  1. Uninstall update KB2966827.

    Control Panel

    1. Open the Start menu, type "Programs and Features", and press Enter.
    2. In the Programs and Features control panel, click "View installed updates" in the sidebar on the left.
    3. Search for KB2966827.
    4. Right-click the update and select Uninstall.

    Command Line[1]

    This command must be run as Administrator.
    wusa /uninstall kb:2966827

  2. Uninstall update KB2966828.

    Control Panel

    1. Open the Start menu, type "Programs and Features", and press Enter.
    2. In the Programs and Features control panel, click "View installed updates" in the sidebar on the left.
    3. Search for KB2966828.
    4. Right-click the update and select Uninstall.

    Command Line[1]

    This command must be run as Administrator.
    wusa /uninstall kb:2966828

Sources

  1. https://support.microsoft.com/kb/934307

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