QuickBooks Error 1601

You don’t have to be an expert in accounting to operate this software. It is easy to understand and operate. You can get an automatic monthly report of your transactions by connecting your bank account with QuickBooks; payment reminders and invoice features keep you up to date always. Quickbooks provides a 360-degree view of your business and simplifies your tasks. In this article, we will talk about one of the most common update errors in QuickBooks desktop i.e. QuickBooks error 1601.

QuickBooks Desktop 2022 – QuickBooks Error 1601 – Windows Installer not accessible

From saving data to browsing the Internet, complex calculations, are all have become possible and easy with computers. The operating system is software that manages the memory of the computer. Several other tasks like making communication possible without knowing the computer language and managing the computer’s memory and processes. There is a plethora of software available today to make the tasks much easier. Quickbooks is one of them. It is accounting software that empowers businesses. This software is responsible for organizing the accounting data, which makes it easier to track sales and bills, create invoices, and the current status of your business.

QuickBooks Error 1601 – Windows Installer is not accessible

QuickBooks Desktop (Win) gives a very common error while installing. Error code 1601 – windows installer is not accessible. This usually happens when there is something wrong with the update utility in windows.

Possible Reasons that is causing the error

  • If the windows are attacked by some virus
  • Downloading a Quickbooks file as a fault
  • Windows Installer gets corrupted
  • Every file gets locked
  • No permission to Windows OS or Quickbooks Software Installation
  • All programs are attacked by malware effect.

Ways to Fix Quickbooks Error 1601 [Step by Step Troubleshooting]

QuickBooks Error 1601 Windows Installer is not accessible
QuickBooks Error 1601 Windows Installer is not accessible [Solved]

Having some basic knowledge in the computer helps in solving the issue at the ground level, also you can understand the issue better when explained by a technician. Once you understand what might be the reason for QuickBooks error 1601 to occur, you can proceed with troubleshooting. Here are some of the troubleshooting methods that can help you resolve this error.

QuickBooks diagnostic tool

  • The first method is to download QuickBooks diagnostic tool. 
  • Once this 648 kb file is downloaded into the system, the user is now supposed to apply and save the changes on this file, and finally click on the run option. 
  • If an error receives continuously, the user needs to follow the further steps that keep popping up depending on the type of problem. 
  • Once the procedure is completed, restart your system so that; all the components are updated properly. 
  • It is important to download the diagnostic tool from its official website only, to assure authenticity. 
  • Finally, update Windows Operating System: Click on the Windows Key given on your keyboard, go to the Windows Update option and select Check for Updates.

Re-install QuickBooks Desktop

This is the second method. 

  • Press Windows key and R key together. It will open the Run command. 
  • Go to Control Panel, then select Programs and Features. 
  • Select QuickBooks and press right click and choose Uninstall option. 
  • You can rename the folders manually or use the Clean Install Tool of QuickBooks. 
  • Finally, download the QuickBooks from its official website and perform the installation procedure. 

Manually fixing the error

  • Type ‘msc’ in the search window, and choose LOCAL SERVICES. 
  • Press right click on Windows Installer and select MANUAL. 
  • Later click on Service Status, set it to Start. This will enable Windows. 

If QuickBooks error 1601 is related to the Windows Installer, then this procedure will resolve the issue.

Computer restart

  • Type ‘cmd’ in the search window. 
  • Select the Command Prompt option and type unregister/msiexec. 
  • Press Enter close the window.
  • Log out of windows and restart your system. 
  • Finally, install the program which was causing the Windows Installer service error.


These were some of the troubleshooting methods to fix the QuickBooks 1601 error. Although these methods can be applied at home only when the error is at its initial stage. In case the error is big to handle, then it must be handled immediately by the experts. Since all your accounting and finance data, files, and information are stored in the system, do not take the risk of the error is getting critical.

Contact QuickBooks Error Support

Hiring a technical team of professionals equipped with the latest technologies and advanced methods and tools is the best to handle the complicated problems of QuickBooks. Error codes are quite common and keep causing many difficulties.

Hiring a team of accounting experts from a certified company can prove to be an asset for your business. You can contact our QuickBooks Error Support team to resolve your error queries in time.

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