An Unexpected Error Has Occured In “QuickBooks”: Returning Null Qbwininstance Handle

Prior to learning about the error fixation of QuickBooks, we should always be aware of causes and the consequences of the issues. With the growing use of QuickBooks software in industries, there are issues that are being faced by the users. There can be enormous reason for this error like intemperate startup passages, damaged components of Microsoft .NET Framework 4.0 SP1 on Windows 7 system, .NET Framework 2.0, registry blunders, equipment/RAM decrease etc.

At an instance when the QuickBooks combination administrator (QBi) is launched and tries to associate with the QuickBooks, it displays a message resulting: Integration Manager could not connect with QuickBooks. Ensure that QuickBooks is open, It displays the error message: An Unexpected Error Has Occured In “QuickBooks”: Returning Null Qbwininstance Handle in the Application section of the Event Viewer in the window.

First of all you have check the functionality of the QuickBooks integration manager (QBi). for this error. This error is mainly common in Windows 7 64-bit machine and basically has the effect that you get disconnected from the file multiple times. It causes a problem with Symantec Endpoint Protection V11 MR5.

Causes behind the An Unexpected Error Has Occurred In “QuickBooks”: Returning Null Qbwininstance Handle

  • Main reason behind this error is – .NET Framework 4.0 SP 1on a Windows 7.
  • QuickBooks company file is damaged or corrupted. 
  • Fitting of the QuickBooks software is corrupted.
  • Registry error  (That indicates the registry of your operating  system  is causing  or corrupted  ) and windows not work properly.
  • Harmful attack (malware virus ) can be the other reason behind this type of error.
  • Suddenly delete the important file of the QuickBooks by an application which is running in the background.

Steps to Resolve This Error “Unexpected Error Has Occured In “QuickBooks”: Returning Null Qbwininstance Handle”.

1. Method One: Re install or Removed the .NET Framework on windows

  • Firstly you have to press the Windows+R keys at the same time, then Run Window open on your system.
  • Then enter the appwiz.cpl in the Run dialog box.
  • After that press enter key 
  • Under the featured list there are options for add /remove all the programs.
  •  After that find the Microsoft.NET Framework 4.0 
  • Select the uninstall option.
  • Once the uninstall process is done then restart your system.
  • Then Restarts done-> step 1 ->open Run window.
  • After that open the control panel .
  • Will be some window display on the screen such as – add/remove or program & features window.
  • If you want to add or remove windows features that are displayed in the left hand side of the window.
  • Then click Add or Remove windows features  programs.
  • Click on the Microsoft.NET Framework  to expand.
  • After that check marked the first and second box.
  • Press OK.
  • Once the all process is completed then press the Finish button.
  • When the installation process is done successfully for the Microsoft.NET Framework 3.5, then restart your system and once again open the QuickBooks integration manager.

2. Method Two: Run QuickBooks using the Diagnostic Tool

  • First of all you need to download QuickBooks Clean Install Tool or Diagnostic Tool.
  • After that open the Tool from the download folder .
  • Install this Tool is carefully on your system.
  • And follow the given instruction, which is displayed on the screen  while installing it on your system.
  • Stopped all the application which is running on the windows  once the installation process is done.
  • Run QuickBooks Diagnostic Tool .
  • Now the problem is fixed then restart your system.

So following these steps will resolve your “QuickBooks”: Returning Null Qbwininstance Handle issue, but still if you face any problem regarding QuickBooks or any related tool, you can always feel free to make a call to our QuickBooks Technical Support Team.

We Provide Technical Support for QuickBooks & Related Products. We have QuickBooks Technical Support Expert Team that will provide you the solutions. We provide regular training to our QuickBooks Technical Support Team so that they can remain updated on the latest technologies and can help the customers in resolving their issues without taking much time.

Our QuickBooks Customers Support Team understands customers’ demand and then serves them accordingly. QuickBooks Customers Support Team ensures that we are available at customer’s service 24*7 by dialing ✆+1-855-481-5338.

See Also Upgrade QuickBooks Accountant Desktop Plus


  1. Which command you have to enter to display the program & features window while fixing an expected error; Returning Null Qbwininstance Handle?

    Enter appwiz.cpl in the run window

  2. What are the significant reasons for occurrence of Error In “QuickBooks”: Returning Null Qbwininstance Handle?

    💠 Damaged elements of Microsoft .Net Framework
    💠 Registry errors
    💠 Less memory
    💠 In-compatible software

  3. How to uninstall .NET Framework in rectifying error of QuickBooks?

    💠 Locate Start menu
    💠 Write run and Hit on Run Command field
    💠 Enter appwiz.cpl
    💠 Press the enter button to Open Program & Features Windows
    💠 Discover Microsoft.NET framework 4.0 and hit on uninstall button
    💠 Once done uninstallation then restart the system

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