QuickBooks Error 15106 is a common update issue that typically occurs when the update program is damaged or blocked by system restrictions. This error often appears during QuickBooks Desktop or payroll updates and can prevent users from installing critical software improvements. Causes may include insufficient admin privileges, interference from antivirus programs, or restrictive User Account Control (UAC) settings. Fortunately, resolving Error 15106 is straightforward with the right approach. Start by ensuring you are logged in with administrator rights. Next, try disabling any active antivirus software temporarily, as it may be incorrectly flagging QuickBooks files. You might also need to adjust your UAC settings to allow smoother software changes. Following these steps can help restore your QuickBooks update process and ensure uninterrupted access to payroll and accounting features. This guide offers a simple, effective solution for fixing QuickBooks Error 15106 quickly and safely.