QuickBooks Error 1603 and Quick Troubleshooting to Fix it Among several errors that hit QuickBooks, installation errors are the most prevalent ones. You can face these errors right after starting the installation or mid-way through the installation. One such error that we will be discussing in this article is QuickBooks error 1603, which runs QuickBooks after the installation is complete. This actually happens due to errors and issues during the installation process. Further in this article, we will be discussing the actual reasons that trigger such an error in the QuickBooks Desktop program and solutions that can quickly get rid of the issue so you can get back on track with your daily bookkeeping activities.