Windows 10: How to fix Error Code 0x800F081F when installing .NET Framework 3.5

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Problem

When you select to install .NET Framework in the Windows Features list in the Control Panel, it does not complete. After asking if you’d like to use Windows Update, it then gives you an error code 0x800F081F

Solution

  • Insert Windows 10 installation CD or mount the ISO
  • Open an administrator command prompt
  • Type the following command (substitute correct drive letter) 
    Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess