Solutions for Quickbooks Error 15106- Firstly, logging in to the system as an administrator: to do this you simply have to click on the Quickbooks Desktop icon then select run as an administrator option, this step would resolve your issue. another step is to clean install Quickbooks in selective startup mode: to do this you are supposed to create a backup of the company file then you have to keep a copy of QuickBooks product and license info. then start the system in selective startup mode and ensure that no other application is hindering in completing the task, now, uninstall or install QuickBooks desktop then end the process by switching back to the normal startup mode. Hope this method will work.