A Handy Troubleshooting Guide For QuickBooks Error 1603 QuickBooks Desktop of Intuit is an accounting application that helps millions of enterprises manage their day-to-day bookkeeping tasks, including creating invoices, tracking inventory, simplifying taxes, etc. But despite being such an advantageous accounting application, QuickBooks Desktop is not safe from errors and technical glitches. This blog will talk about QuickBooks error 1603, which a user can encounter while installing QuickBooks Desktop on their computers. A number of reasons can be behind QuickBooks error code 1603, which you will get to learn reading this blog, along with the troubleshooting solutions to resolve it.