There are several troubleshooting solutions that you can use to fix error 1603 in QuickBooks Desktop. Follow the instructions below and quickly rectify the issue on your own.
1. First, you have to make sure that your Windows operating system is not missing any important updates released by Microsoft.
2. Now get QuickBooks Tool Hub downloaded on your system and proceed with the installation.
3. Once the installation is completed, run the Tool Hub application and go to the Program Installation Issues tab to select QuickBooks Install Diagnostic Tool.
4. Follow the instructions presented by Install Diagnostic Tool to repair the installation errors.
5. Now, if the error reappears, run your Windows in selective startup mode and retry to install QuickBooks.
So these were some troubleshooting solutions you can try to fix QuickBooks error 1603. In case if the error strikes back or the solutions don’t help you resolve the issue, contact QuickBooks support for help at 1.800.579.0391.