The error code of 1603 occurs in QuickBooks when the QuickBooks faces internal damage, this is often the QuickBooks file being damaged. This issue can easily be resolved by using simple troubleshooting methods:
• Navigate to the control panel on your system and then opt the ‘Programs and features’ option.
• Further, search for QuickBooks and then click on the ‘Uninstall’ option that is available beside it.
• Now you would have to delete all the QuickBooks files from your system.
• After you have completely removed all the files related to QuickBooks, do a proper installation of QuickBooks from their official website.
Reinstallation of the QuickBooks software is ought to solve the error code 1603. If this does not solve the issue that you have come across. It would be best for you to connect with the Quickbooks support phone number. They would provide you with all the necessary guidance to overcome the issue.