The .NET Framework is a software development framework provided by Microsoft Windows that offers a runtime environment and a set of libraries and tools for building and running applications ( Linux, macOS, Windows, iOS, Android) on Windows operating systems. Any issues with the framework result in a malfunction where either the applications (or software) will not be able to run or some of their functionality gets restricted.  

Net Framework is the most significant component of the Windows Operating system. By default, it comes with Windows Operating System 10 and 11. Microsoft provides a dedicated repair tool that you can use to repair issues with the .NET Framework and get your apps to run again. 

Note: 

• These versions of .NET Framework supports the repairing tools: the .NET Framework 4.8, 4.7.2, 4.7.1, 4.7, 4.6.2, 4.6.1, 4.6, 4.5.2, 4.5.1, 4.5, 4.0 and 3.5 SP1 (includes .NET 3.0 SP2 and .NET 2.0 SP2).
• The .NET Framework Repair Tool is only available in English.
• All the integrated platforms and .NET Framework versions are listed under “Affected configurations.”

Quick Fixes for Microsoft .NET Framework Errors

Before moving ahead with other error-specific solutions, first, go through these two quick fixes for .Net Framework, which are highlighted below:

Run a DISM Scan

DISM (Deployment Image Servicing and Management) can be used to repair the Windows image, which contains the core components of the Windows operating system, including Net Framework.

The DISM scan is run using Windows Command Prompt (DOS). This scan tool is available in DOS and can be initiated by running a command. Before running the command, you need elevated permissions for the command prompt. This scan will highlight any possible errors or missing files in the Net Framework.

For the elevated permissions, you either need to login as an administrator or have to contact your system administrator. Here’s a command to run DISM scan:

Open an elevated Command Prompt and type DISM /online /cleanup-image /checkhealth

Install the latest Windows Updates

Windows updates are important to stay up to date with all the latest fixes, security patches, and overall improvements offered by Microsoft. Hence, we recommend installing all the latest updates, as they may have fixes to resolve the errors with the .NET Framework. For this, do the following:

1. Click on Start and then Settings.
2. Now, select Update & Security > Windows Update, and then hit the Check for updates icon.
3. If updates are available here, install them at once. 

Preferable Ways to Repair Microsoft .NET Framework 

Below, we have listed what else you can do to fix Microsoft .NET Framework errors except running the repair tool. Let’s have a look:

Step 1: Run the .NET Framework Repair Tool 

1. Firstly, navigate to the Microsoft .NET Framework Repair Tool page and then download the tool from the official Microsoft Download Center website.

2. Now, scroll down to the Download information section.
3. Click on the Microsoft .NET Framework Repair Tool link to download the executable file.
4. After this, choose the file you want to access and then press Next. 

5. Click twice on the Netfxrepairtool.exe to run the repair tool. Then, hit the Yes tab if prompted by User Account Control.
6. Tickmark the I have read and accept the license terms checkbox and click Next.

7. Once done, the repair tool will start performing a few tests to diagnose and fix the issues. This will recommend a few changes. Read the description and Press Next to apply the changes.

8. After making the changes, instead of selecting the Finish button, click Next.

9. At last, hit the Finish icon to close the repair tool.

Step 2: Repair .NET Framework using PowerShell

1. To begin with, hold and press the Windows + S keys on your keyboard to open Windows Search and then type PowerShell in the text field. 
2. Now, hit right-click on PowerShell and choose Run as administrator.

3. Under the PowerShell window, type the following command and then hit the Enter key:

4. After this, if you are prompted to install NuGet – a package manager by .NET Framework, type Y and click Enter.

5. PowerShell will now start to uninstall the .NET Framework from your system.

6. Next, execute the following command to install the latest version of Microsoft .NET Framework:

7. Write down the .NET version ID you want to install and then perform the following command. Replace [PackageID] with the ID you noted.

8. Once done, PowerShell will download and extract the package. Then, you will see a successfully installed message on your screen when the process is complete.
9. Finally, close PowerShell and restart your computer to apply the changes, then check for the error status. 

Step 3: Install an Older .NET Framework Version Manually

1. Head to the .NET Framework download page in the first place.
2. Now, select the .NET Framework version you want to download under the Supported Versions section. 

3. Click on Download .NET Framework XX Runtime on the next page.
4. Once the download is completed successfully, go to the download location and run the dotnetfx.exe file to launch the setup. Later, press Yes if prompted by UAC.
5. Afterward, follow the instructions appearing on your screen to complete the setup.
6. Restart your system and then install the app to see if it is working or not.

Step 4: Use the System File Checker Tool

To run the System File Checker tool, adhere to the steps below:

1. Press the Windows + X key and then enter cmd into the search box.
2. Now, hit right-click on Command Prompt from the search result and choose Run as Administrator.
3. Type the following command and then press the Enter key under the Command Prompt window:

4. Before using the System File Checker tool, the above DISM command is recommended to run as it will provide files required to repair system file corruption. 
5. When you’re ready, enter the following command in the command prompt window and click the Enter tab.

6. The SFC tool will now detect and scan your system files for issues and replace any corrupted files if necessary. Wait for the verification process to complete.
7. Once done, restart your system at the end.

Step 5: Perform System Boot Configuration in Normal Startup

1. Initially, hold and press the Windows + R keys on your Keyboard.
2. Next, type msconfig and Press Enter.
3. Click on the General tab.
4. Then, select the Normal startup option.
5. Hit Apply and then Press OK.
6. Restart your system.

Manually Fix Microsoft .NET Framework Errors 

QuickBooks Desktop basically uses Microsoft programs to run web-based apps, and Microsoft .NET Framework is one of them. The application won’t work properly if there’s an issue with .NET Framework software. 

Windows 10 and Newer

1. Firstly, shut down all open programs.
2. Now, open the Windows Start menu.
3. Type Control Panel into the search and then open Control Panel.
4. Navigate to Programs and Features.
5. After this, choose Uninstall a Program.  

Note: Don’t worry; you are not uninstalling anything.

6. Choose the option Turn Windows features on or off.
7. Search and locate .NET Framework on the list.

Check for both the .NET Framework 4.5 (or later) and .NET Framework 3.5 SP1 Settings.

Note: To fix .NET. Framework 4.5, 4.6, 4.7, and 4.8, you are required to follow the same steps.

Check NET Framework 4.5 (or later)

If the .NET Framework 4.5 (or later) checkbox is unmarked:

1. Click on the checkbox to enable .NET Framework 4.5 (or later).
2. Now, press OK to save your changes.
3. Restart your system.

If the .NET Framework 4.5 (or later) checkbox is already marked:

1. Tickmark the checkbox to disable .NET Framework 4.5 (or later). Don’t turn it back on.
2. Next, hit the OK tab to save your changes.
3. Restart your system.
4. When you try to sign in back into Windows, follow the instructions to turn on .NET Framework 4.5 again.

Check NET Framework 3.5 SP1

If the .NET Framework 3.5 SP1 checkbox isn’t marked:

1. Hit the checkbox to turn on .NET Framework 3.5 SP1.
2. Press OK to save your changes.
3. Finally, restart your system.

If the .NET Framework 3.5 SP1 checkbox is already tickmarked:

1. Click the checkbox to disable .NET Framework 3.5 SP1. Don’t turn it back on.
2. Now, select OK to save your changes.
3. Restart your system.
4. When trying to sign in back into Windows, adhere to the steps to enable .NET Framework 3.5 SP1 once again.

Recommendation: Immediately contact an IT Professional or Microsoft expert if you encounter the errors when turning .NET Framework on or off, as the issue may be regarding your operating system, not QuickBooks.