Error 15106 usually appears when the user is not able to launch QuickBooks after the payroll update. The reason behind is the presence of a spy sweeper in your system or you might not have logged in as an administrator. Here are the troubleshooting steps that you can take to eliminate QuickBooks error code 15106.
1. Firstly, you will have to uninstall the spy sweeper from your system. For that, you will have to go to the add or remove programs menu in your system, scroll the list and locate spy sweeper. Now click uninstall beneath the spy sweeper program
2. The next step includes logging in as an administrator or using another account that has full admin privileges.
3. You may also try to reset the update If you are already logged in as an administrator or couldn’t find a spy sweeper in your system. Go to C:\ProgramFiles\CommonFiles\Intuit\QuickBooks\Components, locate the folder downloadQB, and add old after the extension.