Usually, QuickBooks Error 15103 happens when installing, updating, or fixing software. Registry failures, network problems, or faulty or incomplete installation files are the causes. This problem, which frequently shows a message about a config.msi file, stops users from upgrading QuickBooks or installing fixes. QuickBooks must be repaired or reinstalled in order to troubleshoot. Give our team of QuickBooks experts a call at 1.855.738.2784 if you need help.