QuickBooks, the most versatile accounting software, is trusted by thousands of people across the globe in handling their regular business transactions. With QuickBooks' help, businesses can easily manage sales, track income & expenses, generate financial reports, file tax and payroll. However, no matter how beneficial to use and perfectly designed QuickBooks is, it is not entirely free from technical glitches and errors, just like other accounting software. Among the common errors, QuickBooks error 1603 is the one that many users often encounter while trying to install QuickBooks Desktop on their computers. The error pops up on the computer screen with an error message, which displays, “The update installer has encountered an internal error.” There can be several reasons behind the occurrence of such an installation error that we are going to discuss with you ahead in this post, alongside the solutions to rectify it.

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 Dealing with QuickBooks error 1603 can be pretty complicated. However, all it requires the right troubleshooting guidance that you can get instantly from our QuickBooks support team at the toll-free number (800)-583-0572.

What are the reasons triggering QuickBooks error code 1603?

Generally, QuickBooks error code 1603 gets triggered when there are some complications with the installation files of QuickBooks Desktop. However, there can be other reasons also, like as follows:

  • Any third-party security applications installed on the computer are interrupting the installation of QuickBooks Desktop.
  • The Windows operating system has been outdated.

How to get rid of QuickBooks error 1603?

Solution 1) From QuickBooks Tool Hub, run the QuickBooks Install Diagnostic Tool

  • At first, get the QuickBooks Tool Hub of the latest version ( on the computer.
  • Select the downloaded file named QuickBooksToolHub.exe and start installing it by following the instructions you see on the screen.
  • Right-click the QuickBooks Tool Hub icon and choose the Open option.
  • From the left panel, choose the Installation Issues tab.
  • Under the Fix My Installation Issues section, select the QuickBooks Install Diagnostic Tool button and let the tool run.
  • Once the tool completes the repair, you are required to restart the computer.

Solution 2) Use the Windows safe mode to install QuickBooks Desktop

  • On the keyboard, press Windows + R keys together to open the Run command window.
  • In the Run window, type “msconfig” and then click on the OK button to open the System Configuration window.
  • On the General tab, look for the Selective startup option and select it.
  • Now, choose the Load system services option.
  • Move on to the Services tab and then checkmark the Hide all Microsoft Services checkbox (located at the bottom-right corner).
  • Click on the Disable all button.
  • Clear the Hide all Microsoft services checkbox.
  • From the list of services, make sure to checkmark the Windows Installer checkbox.
  • Click on the OK button.
  • At last, click on the Restart button.
  • Once the computer restarts, try to reinstall QuickBooks Desktop.

Solution 3) Download and install the latest Windows updates

  • On the keyboard, press the Windows key to select the Start menu.
  • Enter “Settings” into the search column and select Settings from the list of search results.
  • In the settings, find the Update & Security option and double-select it.
  • From the left pane of the window, select the Windows Update tab.
  • Select the Check for updates button to download and install the latest Windows update.


If QuickBooks error 1603 persists even after implementing all the troubleshooting solutions explained above in the post, then there are high chances that the Microsoft components required for QuickBooks Desktop to install, like MSXML DLL files or .NET framework are corrupted. Therefore, our recommendation for you is to try to repair the Microsoft components and see whether this fixes the error or not. You can also ask for additional troubleshooting assistance resolving the installation error from our QuickBooks support team at the toll-free number (800)-583-0572.