Learn how to troubleshoot QuickBooks error code 4120:

Stumbled upon QuickBooks error 4120 and unable to decide what to do? Well, need not to worry, as we will be talking about the causes and fixes of QuickBooks error code 4120. This error can be seen at the time of installation of QuickBooks. it comes up with an error message stating as:

“QuickBooks has encountered a problem and needs to be shut down without any further explanation”.

In case the operating system is corrupted or one of the important Microsoft parts that QuickBooks desktop makes use of is not stable or working, then the errors listed below can be seen. You can download and access the QuickBooks install diagnostic tool to fix the error.

To know more, make sure to read this post carefully till the end. Or you can also get in touch with our professionals via helpline number i.e. 1-800-761-1787. We are U.S based best accounting experts and certified professionals who work round the clock to provide you with the best possible support services. Help is available 24/7.

You may also like: How to Fix QuickBooks Desktop Installation Errors?

What leads to the QuickBooks error code 4120?

You can end up in the QuickBooks error 4120 due to the below listed factors:

  • In case any software change occurs to QuickBooks, then the windows registry has been corrupted.
  • When QuickBooks is incompletely installed or there is some corruption.
  • If the files of QuickBooks are deleted by some program.
  • When virus on the system harms the files that are related to windows. This poses a threat to QuickBooks related files.
  • If the QuickBooks executable file or other components are marked unsafe.

Effects of QuickBooks error 4120

When QuickBooks error 4120 appears, the software doesn’t work properly and responds slowly to the active. The system might also crash and freeze or hang for some time.

Methods to fix the QuickBooks Error Code 4120

By now, you might be well versed with the causes and other information related to the error code 4120. Let us explore the methods one by one:

Method 1: Reinstalling or repairing QuickBooks

The very first method can be to reinstall or repair QuickBooks desktop. The steps to be followed are as follows:

  • The initial step is to move to the control panel and then uninstall QuickBooks.
Uninstall and Reinstall QuickBooks on your server computer - Screenshot
  • Once done with that, you need to repair the software.
Repair QuickBooks Desktop - Screenshot
  • And if the error persists reinstall your QuickBooks desktop.

Method 2: Copying company files to another system

You can also copy the company files to another system. The steps involved in this process are as follows:

  • At first, you need to copy all the company related files to some other system. And check if you are able to open the files or not in another system.
  • In case the file opens, then it is recommended to repair the windows of the previous system.
  • And if the files do not open in other system as well, then it means that the files are damaged. These files can be fixed by using the file doctor tool.

Read Also: How to Resolve QuickBooks Desktop Display Issues?

Method 3: Checking for any system errors

Another method to fix the error can be to check for any system errors. This process involves the steps below:

  • Firstly you need to update antivirus of the system and antimalware programs.
  • After that scan the system once the program is activated.
Scanning the system for malware or virus attack - Screenshot
  • Now eliminate the virus.
  • And if no virus detected then, try other solutions.

Method 4: Use QuickBooks file doctor tool

QuickBooks File Doctor - Screenshot

You can make use of the QuickBooks file doctor tool. This tool is designed and developed in a way to resolve all sorts of company file related issues. Also, you can run and diagnose to check errors and get rid of them automatically. You can download the file doctor tool from QuickBooks tool hub.

Method 5: Run disk cleanup

Run disk cleanup - Screenshot

You might experience the runtime error due to very low free space on the system. In such a situation, the below steps can be followed:

  • At first, you should consider backing up the files and freeing up space on the hard drive.
  • You are then required to clear the cache and reboot the system.
  • Also, you can run the disk cleanup and open the explorer window and hit a right click on the main directory (which is usually C:).
  • The final step is to click on properties tab and also click on the disk cleanup.

Manually resolving the issues

If the above methods failed completely, then in that case, we recommended to carry out the below manual troubleshooting steps.

  • Clear the junk of the system.
  • And then, repair the registry entries.
  • Finally use windows system restore and undo the recent changes.

You may see also: How to Register or Activate QuickBooks Desktop?


The above stated methods are enough to fix the QuickBooks error code 4120. However, if the error continues even after carrying out the above step, then in that case, feel free to get in touch with our QuickBooks error support team. All you need to give us a call at our dedicated support number i.e. 1-800-761-1787, and our team will ensure to provide you with immediate technical assistance.


Other helpful articles:

How to Fix QuickBooks Desktop Update Errors?

How to Fix QuickBooks Error Code 6094, 0 (6010, 2)?

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