If you are a QuickBooks user and you have recently come across the error code 1603, then the steps which you would have to use to solve this error is as follows: ? Access the control panel on your system. ? Further, navigate to the ‘Uninstall a program’ option which is available on the Control Panel. ? From the list of options available you would have to uninstall all Microsoft MSXML and C++ components. ? Once you have successfully uninstalled the said components, restart your system. ? After your system is rebooted, install all the uninstalled components from the Microsoft website. If you face any issue while following the steps to fix this QuickBooks error, then it would be ideal for you to connect with QuickBooks Customer Support and attain professional guidance regarding the same.