Error Code 0x800F081F is one of the most common errors faced by Windows 10 users. This error occurs when users try to install .NET Framework 3.5 on their Windows 10 device.

Many users have complained that they encountered this error while installing a new application or trying to update their existing software. The error usually pops up with a message “Installation Failed,” followed by the error code. In this article, we will discuss how to fix Error Code 0x800F081F in Windows 10.

Method 1: Using Control Panel

The first and most straightforward method to fix this error code is to use the Control Panel. The Control Panel is a built-in Windows feature that allows you to make changes to your system settings. Here’s how to do it:

1. Go to the Start Menu and type “Control Panel.”

2. Open the Control Panel and click on “Programs.”

3. Click on “Turn Windows features on or off.”

4. Locate the “.NET Framework 3.5” option and check it.

5. Click on “OK” and wait for the installation process to complete.

Method 2: Using Command Prompt

If the Control Panel method fails, you can try fixing the error code using Command Prompt. Command Prompt is a powerful tool that lets you execute a wide range of commands on your Windows machine. Here’s how to do it:

1. Go to the Start Menu and type “Command Prompt.”

2. Right-click on the Command Prompt icon and select “Run as administrator.”

3. Type the following command into the prompt:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source::\sources\sxs /LimitAccess

Note: Replace “” with the letter of the drive where your Windows system files are stored, such as D: or C:

4. Press Enter and wait for the command to complete.

Method 3: Using Registry Editor

The third method to fix Error Code 0x800F081F is to make changes to the registry editor. This method should only be used if you have advanced knowledge of Windows and are comfortable making changes to the registry. Here’s how to do it:

1. Go to the Start Menu and type “Registry Editor.”

2. Right-click on the Registry Editor icon and select “Run as administrator.”

3. Navigate to the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

4. Right-click on the “AU” folder and select “New” > “DWORD(32-bit) Value.”

5. Name the new value “UseWUServer” and give it a value of “0.”

6. Close the Registry Editor and restart your computer.