QuickBooks Error C=343

No matter how diligently you attempt to avoid encountering errors while working with QuickBooks, one or more errors will inevitably occur and disrupt your entire workflow. QuickBooks errors are represented by an error code, and today we will cover one such error code, namely QuickBooks error  C=343.

This error message is displayed as a result of Windows compatibility concerns. This issue may occur if you are unable to access the QuickBooks corporate files. The causes of a mistake might be numerous, and the issue can be resolved by executing a series of procedures. All of this will be explored in greater detail later in this technical portion. Thus, if you are also concerned by such an error, simply keep an eye on this writing and learn how to get rid of it.

An alternative to this is to contact our QuickBooks error, help team. You can contact us at any moment and speak with one of our accounting professionals or certified specialists about the issue.

QuickBooks error code C=343
QuickBooks error  C=343

What is the meaning of QuickBooks error  C=343?

Frequently, you will encounter the QuickBooks error code C=343 while opening QuickBooks desktop, along with the following error message:

As a result of this problem, you may be unable to access the company file and QuickBooks may become unresponsive. It should be reminded that you are responsible for regularly updating software in order to avoid any subsequent troubles. There are other possible causes of this type of problem, which we shall cover later in this essay.

What causes the QuickBooks error code C=343?

The causes of QuickBooks error code C=343 are numerous; some of the more typical ones are described below:

It is possible to determine if the file is damaged.

If the file is not present,

When the file is unregistered, an identical issue occurs.

Additionally, if you are not operating the most recent version of the QuickBooks accounting software, such an error may be displayed.

If the Microsoft core XML services.dll files are corrupted, missing, or unregistered


There are a few different approaches that can be used to resolve the QuickBooks problem number C=343. We’ve included a few of the most prevalent below; have a look:

Method 1: Run QuickBooks in a protected mode

  • To begin, press and hold the Ctrl key while double-clicking the QuickBooks icon.
  • QuickBooks will launch in safe mode, allowing for the creation of numerous company files.
  • Additionally, double-click the file.
  • Select the open file and browse the contents.
  • Now, if QuickBooks opens but the new company file does not, you must run validate and rebuild data:
  • To accomplish this, choose the file.
  • Navigate to the operations with files section.
  • Confirm rebuilding

Method 2: Deactivate and reactivate MSXML.dll files

This method requires that you first open the download page and then search for the files.

Following that, the system’s files will be downloaded.

The following step is to install these files on the system, followed by a double-click on the MSXML.MSI file and following the full instructions on the screen.

The final step is to restart QuickBooks and verify that the fault persists.

Method 3: Make use of the QuickBooks installation diagnostic tool.

Step 1: Save the QuickBooks tools hub software to your computer.

  • Close the QuickBooks desktop application and click here to get the most recent version of the QuickBooks Tool Hub.
  • Save the downloaded file to a location that is easily accessible.
  • Now, double-click the downloaded file titled (QuickBooksToolHub.exe).
  • To install this tool, follow the on-screen instructions and accept the terms and conditions.
  • Double-click the tool hub icon to open it after the installation is complete.

Step 2: Launch the QuickBooks Install Diagnostic tool from the program’s tools area.

  • Select the Installation Issues tab in your Tool Hub software.
  • QuickBooks Install Diagnostic Tool should be selected.
  • Allow the tool to run.
  • Take note that depending on the web speed and the performance of your computer, this process may take up to 20 minutes.
  • When all of the processes have been completed, the final step is to confirm that all components have been updated successfully and to reboot the system.

Method 4: Upgrade QuickBooks to the most recent version

If your programme is not updated to the most recent version available, it is critical that you do so. You must first upgrade QuickBooks to the most recent version and then reopen QuickBooks. Often, a simple update will resolve the issue, as it includes many repairs and enhancements.

  • QuickBooks must be updated by selecting the update now option.
  • Download and install any available updates.
  • Additionally, reboot the system.
  • Finally, restart QuickBooks to verify that the error has been addressed.

Method 5: Make a backup of the MSXML.DLL files

  • MSXML.DLL files are used to interface third-party apps with QuickBooks. Consider the following methods for saving these files:
  • For use with 32-bit frameworks
  • If you are working with the 32-bit framework, you must first launch the run command window
  • Enter the Regsvr32 MSXML.dll in the search area.
  • The following step is to click the OK tab.
  • And you will not get a prompt indicating that the registration was successful.
  • Restart the software to apply the changes.
  • For use with 64-bit frameworks
  • To use the 64-bit framework, the Run command window must be opened.
  • Access the search area by navigating to it. Following that, type cmd to open the command prompt window.
  • Press the enter key.
  • Complete the CD windows-syswow64 command and then click the OK tab.

The following step is to type Regsvr32 MSXML3.dll and then press the enter key.

Fill in Regsvr32 MSXML4.dll and press the enter tab once more.

Both.dll files should now be successfully registered.

To complete the process, restart the QuickBooks software.

Using the clean install tool as a sixth method

If none of the above procedures worked for you, you can perform a clean install using the clean install tool. It is recommended that you keep a backup of the data file in a secure location. After that, run the utility to correct the issue.

The following steps must be taken:

  • To begin, remove the QuickBooks desktop from your computer.
  • To view RUN, press the Windows + R keys.
  • Navigate to the control panel and click the OK tab as well.
  • The following step is to navigate to the programmes and features tab.
  • Navigate to the programmes menu, choose QuickBooks, and then click uninstall.
  • Complete the process by following the directions.
  • After that, rename the installation directories.
  • You may install QuickBooks cleanly by downloading and using the QuickBooks clean install programme.
  • Then double-click the QuickBooks clean install exe to begin.
  • Choose That is what the licence agreement states.
  • Choose QuickBooks desktop and then click the proceed tab.
  • Finally, click the OK button when the message “QuickBooks is ready to perform a clean install” appears.
  • Proceed to manually rename the QuickBooks desktop installation folders.
  • After that, reinstall the QuickBooks desktop.


Method 7: Correct the error manually

  • You can manually correct the error by following the instructions below:
  • To begin, you must re-register all of the QuickBooks accounting software’s required files and folders.
  • Restart the QuickBooks software to determine whether the issue has been resolved.
  • If the error recurs, you must download and reinstall Microsoft’s code XML services.

Once you have completed all of the preceding steps, it is expected that the QuickBooks error number C=343 will be resolved. However, if the error continues to cause you problems, it is highly recommended that you contact a team of specialists and qualified ProAdvisors and request that they resolve the issue on your behalf.