Windows update error code 0x800f081f may be caused by an error in NET Framework 3.5 compatibility. It can also be caused by several factors, such as corrupted system files. There are various error messages that appear as much as there are various factors as follows.
- 0x800f081f Source file not found.
- Could not find .NET Framework 3.5 offline installation source files.
- .NET Framework 3.5 installation error 0x800f081f
It tries to solve the problem one step at a time, from easy to difficult steps, and stops when no error code occurs.
Method 1. Check system files
1. Click [Magnifying Glass] next to the Windows Start menu.
2. Enter 'command' and select [Run as administrator] from the menu on the right that appears.
3. Type 'sfc /scannow' and press Enter.
4. When the system check is complete, type 'exit' and press Enter.
5. After restarting the PC, execute the update. If error code 0x800f081f occurs during update, proceed to the next method.
Method 2. Resolving damage with the repair command
1. Click the [magnifying glass icon] next to the Windows Start menu.
2. Enter 'command' and select [Run as administrator] from the menu on the right that appears.
3. Enter 'dism /online /cleanup-image /restorehealth' and press Enter.
4. A system check is performed and damaged files are repaired.
5. When finished, restart your PC. And try updating again. If the Windows update error code 0x800f081f occurs again, proceed to the next method.
Method 3. Run the Windows Update Additional Troubleshooter
1. Click the Windows Start menu.
2. Select [Settings].
3. Select [Update & Security].
4. Select [Troubleshooting].
5. Select [Additional troubleshooters].
6. Select [Windows Update].
7. Select [Run troubleshooter].
8. After the troubleshooter completes, restart your PC. If the update error code 0x800f081f appears here, proceed to the next step.
Method 4. Resolve by reinstalling Net Framework 3.5
1. While holding down the [Windows logo], press the 'R' key.
2. Enter 'appwiz.cpl' and click [OK].
3. In the [Programs and Features] window, select [Turn Windows features on/off].
4. Uncheck [.NET Framework 3.5 (including NET 2.0 and 3.0)] and click [OK]. Then, the messages 'Searching for necessary files' and 'Applying changes' are displayed.
5. When complete, a message appears saying [Windows has completed the requested changes]. Click [Restart].
6. After the PC reboots, press the 'R' key again while holding down the [Windows logo key] on the keyboard.
7. Enter 'appwiz.cpl' and click [OK].
8. In the [Programs and Features] window, select [Turn Windows features on or off].
9. Check the [.NET Framework 3.5 (including NET 2.0 and 3.0)] checkbox and click [OK].
10. Messages such as 'Searching for necessary files' and 'Applying changes' appear. And continue following the prompt to install '.NET Framework 3.5'.
11. When finished, the message [Windows has completed the requested changes] is displayed, click [Restart].
12. After restarting the PC, proceed with Windows Update. If error code 0x800f081f appears, proceed to the next step.
Method 5. Manually Install Net Framework 3.5
1. Click the address below and download the Net Framework 3.5 installation file to your PC.
https://dotnet.microsoft.com/download/dotnet-framework/net35-sp1
2. Double-click the downloaded 'dotnetfx35.exe' file to install it.
3. Select [Download and install this feature].
4. Follow the prompts to complete the installation.
5. After restarting the PC, proceed with the update.
Windows update error code 0x800f081f has various causes, such as the installation process of .NET Framework 3.5 or damage to system files. However, most of them are solved by executing the method described above.
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