The QuickBooks Error 1603 is an installation issue that can be fixed if the QB installation is corrected. Practice the steps below to follow the right path -
Uninstall QuickBooks from the device.
Press and hold the Windows key + R on your keyboard to open the Run prompt box.
3In the search panel, type MSCONFIG and hit the OK button.
4In the following window, go to the Boot section and check the Safe Mode option.
Tap on Apply and hit the OK button.
Allow your Windows to start in the Safe Mode.
Now, reinstall QuickBooks using the installation file.
Follow steps 2 - 5 again, this time you must uncheck the Safe Mode option.
Restart the computer and access QuickBooks.
It is best that you also get some expert advice to deal with QuickBooks Error 1603, at TFN anytime.