NAM THẦN LƯỢN ĐI MCÀI NET FRAMEWORK 3.5 CHO WIN 8.1

Steps for installing .net framework 3.5 in Windows.

Summary: Steps for installing .net framework 3.5 in Windows.See less Steps for installing .net framework 3.5 in Windows.


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This article provides information on how to install .NET Framework 3.5 within Windows 8 / 8.1 / 10 to resolve potential application compatibility issues.

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Issue installing applications that need .NET Framework 3.5 in Windows 8 or 8.1

Both Windows 8 and 8.1 ship with the newer version of .NET Framework--version 4.5 for Windows 8 and version 4.5.1 for Windows 8.1. There may be times when an application requires the previous .NET Framework version 3.5 and won"t install on a system with Windows 8 or 8.1.

When trying to install the program in Windows 8 or 8.1, an error code of 0x800f081f may appear along with the following message (Figure 1):

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Figure 1

The same error will also appear if .NET Framework 3.5 is enabled in Control Panel/Programs and Features/Turn Windows features on or off (Figure 2):

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Figure 2

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Steps to install .NET Framework 3.5 in Windows 8 / 8.1 / 10 and resolve the issue

To resolve this issue, you can manually install .NET Framework 3.5 from the Windows 8 or 8.1 install media using the Deployment Image Servicing Management (DISM) CMD tool. Follow the steps below to ensure the software is installed correctly:


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Note: It is recommended before you perform the steps below that you create a backup of your system files. You can use the bephongngoaidon.com Backup and Recovery Manager to create a restore disc for your system.
Insert the Windows 8/8.1 install media and note what drive letter is allocated to it (normally this will be ‘D:’ if no Optical Disc Drive is installed, and ‘E:’ if an Optical Disc Drive is installed). Run the command DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:x:\sources\sxs remembering to replace the letter "x" within "Source:x" with the drive letter of the install media. The CMD window will show a progress bar; the process should take 3-5 minutes to complete. You should now be able to install the initial application that needed the .NET Framework 3.5 version.

Please refer to this issue at Microsoft"s Developer Network

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site for further information.

Windows 10 Instructions:

Once the file downloads, you can simply mount it by double clicking it. Now open an Admin Command Prompt and use DISM.exe to install .NET Framework 3.5 (replace D with the drive letter that your Windows 10 ISO image was mounted to): DISM.EXE /Online /Add-Package /PackagePath:"D:\sources\sxs\Microsoft-Windows-NetFx3-OnDemand-Package.cab" Once the command completes, you can check that .NET Framework 3.5 was successfully installed by reopening the Turn Windows features on or off dialog.

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