• .NET Framework 3.5 error can prevent you from running certain applications on your PC.
• Using the Windows installation media is the quickest way to fix these types of issues.
• Reinstalling the the framework can also help if you're having issues with it.

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Many application requires certain components to work properly, and if there’s an issue with it, the entire software is affected.

One of the most used tools is .NET Framework since it offers great features, and many developers use it while creating their apps.

Unfortunately, if there’s an issue with the framework, your application might not be able to run at all, and in some instances, you won’t even be able to install it.

In this article, we will concentrate on many of the common .NET Framework 3.5 errors and how to fix them, so let’s get started.

How does .NET Framework work?

.NET Framework is an execution environment that offers a wide array of services to apps. Developers use it to create apps for the Windows platform.

If the application is created with a certain version of the framework, you need to have it installed to run and install that software. For more information, visit our guide on how to install .NET Framework.

Why do .NET Framework errors occur?

In most cases, these types of errors are caused by file corruption. There are numerous reasons for this and they can vary from system damage to malware infections.

Luckily, you can fix these issues with ease by reading our .NET Framework 3.5 is missing guide.

How can I fix common .NET Framework 3.5 errors on Windows 10 & 11?

➡ Fix .NET Framework error 0x800F0906, 0x800F081F, and 0x800F0907

Download the Windows Media Creation Tool.

Select Create installation media and click Next.

Choose ISO file and click Next.

Press Windows key + R and type gpedit.msc. Press Enter.

When opens, expand the Administrative Template folder on the right, and click on System. Now double-click Specify settings for optional component installation and component repair.

A properties window will open. Change it to Enabled. Set Alternative source file path to E:/sources/sxs

Press Windows key + X and choose Windows PowerShell (Admin) from the menu.

Run the following command: gpupdate /force

In step 9, make sure to use the path that matches the path of the mounted ISO file.

➡ Fix .NET Framework error code 0x800F0922

Open the mounted ISO, and go into the sources folder.

There should be a folder named sxs. Copy the folder to another location on your computer. For example, in this tutorial, we’ll copy it to the root directory of our D drive.

Right click on the copied folder, and choose Properties from the drop-down menu.

Click on the Security tab. Select your user name from the Group or user names box; check if there is a check mark next to Read and Write in the Permissions box.

If you don’t find the check marks, you should click on the Edit button, select your username, and check both the Read and the Write box in the Allow column. Save changes.

Press Windows key + X and choose Windows PowerShell (Admin).

Be sure to replace D:\sxs in step 8 with the path that matches the one from your computer. We just used this as an example on our PC.

➡ Fix .NET error code 0x80071A91

Press Windows key + S and enter turn features. Select Turn Windows features on or off.

You should find an item named .NET Framework 3.5 (includes .NET 2.0 and 3.0), deselect it, and wait for the operation to finish. After that, restart your computer.

How can I can I fix .NET Framework 3.5 errors on Windows 11?

➡ Use the DISM scan

Press Windows key + X and select Windows Terminal (Admin).

Although this solution is for Windows 11, you can also use it in older versions of Windows as well.

Expert Tip: Some PC issues are hard to tackle, especially when it comes to corrupted repositories or missing Windows files. If you are having troubles fixing an error, your system may be partially broken. We recommend installing Restoro, a tool that will scan your machine and identify what the fault is.
Click here to download and start repairing.

Does .NET Framework come with Windows?

Yes, .NET Framework comes preinstalled with Windows. You can find version 3.5 up to 4.8 installed on Windows 10 PCs. Do keep in mind that the former has to be enabled manually in some cases.

As for Windows 11, it comes with the latest version available out of the box.

Is .NET Framework backward compatible?

Starting from version 4.5, .NET Framework is compatible with the previous versions. So even if the application is built using version 3.5, it will work without issues in most cases.

If you’re an app developer, you might have to make a few changes to your configuration to ensure that everything is working properly.

This was a list of the most common .NET Framework 3.5 errors you’ll face on the Windows platform, and as you can see, they are relatively simple to fix.

In case you’re having more problems with this component, we suggest that you visit our guide on how to fix the corrupted .NET Framework.

We hope it had the error you were looking for. Tell us in the comments section if it worked for you, or if there is another error you’d like us to cover.

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