.NET Framework 3.5 installation error: 0x800F0906, 0x800F081F, 0x800F0907. This problem occurs when you try to install the Microsoft .NET Framework 3.5 on a computer that is running Windows 8.1, Windows Server 2012 R2, Windows 8 or Windows Server 2012.
This error code occurs because the computer cannot download the required files from Windows Update. This behavior can be caused by network, proxy, or firewall configurations or by network, proxy, or firewall failures. To resolve this problem, try to connect to the Microsoft Update website. Community. Getting Started with Office 2010. Word, PowerPoint, Excel and Outlook Help. Outlook Web App.