QuickBooks Error Code 15106 usually appears while updating payroll and is often linked to security settings or admin restrictions. Common causes include insufficient admin rights, antivirus interference, or damaged update files. This error stops payroll updates and interrupts employee payment processing. To fix it, log in as an administrator, disable conflicting security applications, and download updates again. Payroll users must resolve QuickBooks Error 15106 quickly to resume smooth operations. When regular troubleshooting does not work, professional help may be required. Call +1-866-408-0444 for reliable guidance to fix QuickBooks Error 15106 and complete payroll updates successfully.