Fix QuickBooks Error 3100 – Steps to Fix, Causes, Signs and Symptoms

QuickBooks Error Code 3100 occurs when adding a new employee/customer’s information. This error shows that there’s an existing customer, vendor, or employee with the same name. To know how to fix Error Code 3100 in QuickBooks, Keep Scrolling!

QuickBooks is software global businesses use to manage their financial records in an organized manner. The hype of this software in the United States & Canada business market is because of its hassle-free and easy User Interface.

However, a few times QuickBooks Error Code 3100 could appear while maintaining the record of any new employee/vendor/customer. Well, Error 3100 in QuickBooks is quite common, and it can be fixed in a few steps. Before deep diving into the steps to fix QuickBooks Error 3100, understand the reasons behind this error and its characteristics.

What is QuickBooks Error Code 3100?

QuickBooks Error Code 3100 appears when a user tries to save details of a new employee/ customer/ vendor into the database of QuickBooks. If the information of the new employee/ customer/ vendor already exists in the Create Customer Request section, error code 3100 will appear. As a simple solution to fix this error, the user must check out the names of these three entities mentioned above, and then rename them as per the requirement.

QuickBooks Error Code 3100

The following message will be displayed if any user faces QuickBooks Error 3100:

“Error 3100: QuickBooks has encountered a problem and needs to close. We are sorry for the inconvenience.”

Signs and Symptoms of QuickBooks Error Code 3100

Here are the signs and symptoms that can be encountered by users who are facing QuickBooks error 3100 while adding new customer details.

  • Window Crashes.
  • Pop-up notification regarding the QuickBooks Error Code 3100.
  • After a few moments, the QuickBooks desktop keeps freezing.
  • Keyboard and mouse commands not recorded.

In general, QuickBooks Installation held by the user will stop working as soon as error 3100 is detected.

What is the Causes of QuickBooks Error 3100

If the user doesn’t find similar existing details in the Employee Center, and still the error appears, there might be other reasons behind this error. Enlisted below are the causes of QuickBooks Error 3100:

  • Registry of the Windows is damaged or corrupted.
  • Incomplete QuickBooks installation or corrupted QuickBooks download.
  • Unknowingly deleted company or program files of QuickBooks.
  • Malfunctioning due to the attack of computer viruses.

Steps to Troubleshoot QuickBooks Error Code 3100

Below are the steps that will briefly explain troubleshooting of the error 3100 in QuickBooks.

  • Enter Distinct or Unique Vendor, Customer, or Employee Details.
  • Setup Correct Windows Registries related to QB Error 3100.
  • Conduct a System Malware Scan to detect any Viruses.
  • Remove Cache and other System Junk.
  • System Drivers should be Updated
  • Restore to Previous System Settings
  • Reinstall QuickBooks Software
  • Resolve Issues Related to the Customer Names

How to Fix QuickBooks Error Code 3100?

Check out the step-by-step guide to fix the QuickBooks Error Code 3100 provided below:

Solution 1: Enter Distinct Details in the Database

Here’s how to enter unique details of Customer, Vendor, or Employee in the database of QuickBooks-

  • Enter the proper login information to access the company’s Salesforce account.
  • Select the tab for accounts. In the lower right corner of the window, select Merge Accounts.
  • Enter the name of the duplicate account in the text field, then click the “validate” button to start the merging process.
  • Don’t forget to leave the Customer List ID value in place. It should now be possible to add a new client, supplier, or worker.
  • A new customer, employee, or vendor details can now be added.

For QuickBooks POS users:

It is unlikely for a QuickBooks POS user to face error 3100. However, if any user faces this error, navigate to the Customer Menu and select the Customer List. Detailed steps are discussed below

  • After opening the customer list, user must enter the name displayed in the error into the Search form and look for any duplicates.
  • Next, they must select the I want to drop-down menu and click Merge.
  • After that is finished, the user will see a merge window where they must choose which customer vendor to keep and which to dismiss.
  • The process’s last phase is to proceed with the customer/vendor merger. Please be aware that the names of the transactions done under both names will be the names filled out by the user.

Solution 2: Change Windows Registries Settings related to QB Error 3100.

Follow the steps mentioned below to set up the Windows registries to reduce the chances of facing QuickBooks Error Code 3100.

  • Click on the Window tab or Start.
  • Fill out the Command in the dialogue box displayed.
  • Press Ctrl + Shift and then press Enter.
  • A permission dialogue box will pop up on the screen.
  • Select Yes.
  • A command prompt will be displayed along with a blinking cursor.
  • Fill out ‘regedit‘ and then press the Enter tab.
QuickBooks Web Connector Error 3100
  • In the Registry Editor, select the keys corresponding to the QuickBooks Error Code 3100.
  • Select ‘Export‘ from the File menu bar, in the top right corner
  • Click on the folder that is to be saved
  • Look out for the QuickBooks Backup files by entering the names of the designated file that has to be copied.
  • Choose ‘Selected Branch‘ from the Export Range.
  • Click on the Save button
  • At last, save the file by adding .reg as an extensive.

Solution 3: Administer a System Malware Scan for Virus Detection

To ensure that the computer system is not malfunctioning, it is important to run a full system malware scan. This scan via any anti-virus software will help detect any virus that disrupts the smooth functioning of the user’s computer.

Solution 4: Clear Cache and System Junk

Since we use our computer system regularly, it is obvious that it starts storing junk files. These files create an imbalance, and our computer system starts working slowly. Sometimes, it also leads to malfunctioning and becomes a primary cause of QuickBooks Error 1300. To eliminate such unwanted files from the system, one must regularly clean junk files.

Refer to the steps provided below to clear system junk files and clear cache.

  • Click on Windows or Start button
  • Without hitting on the Enter tab, fill out the Command.
  • Now, Press Enter Tab along with Ctrl+Shift.
  • A dialog box requesting permission will open.
  • Press the “Yes” button.
  • It will show the command prompt.
  • Enter “cleanmgr” and click the Enter tab.
  • Disk Cleanup is going to assess how much disk space is used.
  • Tick the boxes and click the “OK” button.

Solution 5: System Drivers should be Updated

To update the system drivers of the computer, follow the steps provided below.

  • Click on Program and Features
  • Lookout for the NETGEAR adapter, and then select Uninstall.
  • Click on Windows>Power>Restart
  • Reinstall the driver software
  • After receiving the prompt, plug in and connect the adapter to eliminate any issues in the system.

Solution 6: Restore to Previous System Settings

Users must Undo the current settings of their computer system to ensure that it is back to its default settings. This can be executed by using the Window System Restore option. Here are the steps to restore computer system setup to default settings.

  • Press the “Windows” or “Start” button.
  • In the search bar, type “System Restore” and press “Enter.
  • Press the System Restore button.
  • Enter the administrator password when asked.
  • Lastly, restart the system.

Solution 7: Reinstall QuickBooks Software in the Computer

Users can uninstall and then reinstall the QuickBooks Software in the computer system, this will enhance the performance of the program and reduce the chances of facing QuickBooks Error Code 1300.

  • Initially, users must use the “Start” button to bring up the Features and Programs window.
  • Click the “Control Panel” after that. Select “Programs.
  • To access “Programs and Features,” click.
  • Follow the QB applications connected to the “QuickBooks Error Code 3100” issue.
  • Choose the related QuickBooks entry.
  • Click the Uninstall option.
  • Users can now use QuickBooks without encountering any errors by reinstalling it.

Solution 8: Resolve Issues Related to the Customer Names

The final step that can be taken to fix the QuickBooks Error Code 3100 is by manually fixing the customers’ names as per the requirements. Follow the steps below to learn how to adjust customers’ names, edit details, and save and eradicate Error 3100.

Add Details of a New Customer

  • Going to the customers menu and choosing the customer center is the first step.
  • Next, the user must select the “New Customer” and “Job” tabs, then click on “New Customer” from the list of options.
  • The final step is to select the “OK” tab after inserting the test customer from the name and leaving the other fields empty.

Merge the Names

  • Initially, the user must look for the client’s name, right-click on it, and select “Edit customer.
  • Additionally, take note that if the user selects an option below the customer, a blank cross will appear.
  • The cross needs to be adjusted and dragged beneath the name of the new customer. In addition, the user needs to type the customer’s name and click the “OK” tab after that.
  • Select the “OK” tab after the merge window appears on the screen.
  • Subsequently, the user must edit the customer’s name by entering the original name again and selecting the “OK” tab.
  • The final action is to close the QuickBooks desktop and also
  • As a final step, users must close the QuickBooks Desktop and reopen it.


QuickBooks Error Code 1300 detected while adding a new customer, vendor, or employee name is a common error. Common causes behind this error are existing similar information in the database, incomplete installation of QuickBooks Software, malfunction due to computer viruses, and deleted important QB company/program files. However, It can be resolved easily. A detailed explanation of how to fix QuickBooks Error 1300 has been provided in this article.

Frequently Asked Questions

When does QuickBooks Error Code 3100 appear?

QuickBooks Error Code 3100 appears when a user is trying to add details of a new customer, vendor, or employee. This is mainly because of the similar information fed into the QuickBooks database.

What are the causes of QuickBooks Error 3100?

The causes of QuickBooks Error 3100 are the same information saved in the Employee Center, damaged or corrupted Windows Registry, incomplete update installation, corrupted QB software download, deleted company file/software, and virus attack.

How to Resolve Error Code 3100 in QuickBooks?

To resolve the Error code 3100 in QuickBooks, the user is required to enter unique employee/vendor/customer details, change Windows registry settings, conduct a virus scan, clear junk files, restore to default settings, uninstall and reinstall QB software, and resolve the problem associated with the customer name.

What are the Characteristics of QuickBooks Error Code 3100?

If users are facing QuickBooks error code 3100, certain characteristics or symptoms will be exhibited. The characteristics of QB Error 3100 are pop-ups related to the error, system Windows will crash, QuickBooks software will freeze and keyboard and mouse responses will not be registered.

close btn

Get Your Case Study

Call Now+1-800-596-0806