If you are trying to install Microsoft .NET Framework 3.5 on Windows 8 or 8.1 and receive this error code: 0x800F0906 Then try this: Insert your Windows 8 or Windows 8.1 Installation Media, be it a USB Flash Disk or the Windows 8 DVD Press the Windows + X Button, then choose: Command Prompt (Admin) Now copy/paste this code in the command prompt: Code: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:X:\sources\sxs Substitute X:Sources\sxs with the drive of your DVD Drive or USB which contains the Windows 8 installation Example: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:F:\sources\sxs Press ENTER and wait while the installation completes