QuickBooks Payroll Error 80029C4A usually occurs when payroll-related DLL files are missing, damaged, or not properly registered. This error can prevent payroll updates and disrupt employee payments. Common causes include incomplete QuickBooks installation, antivirus conflicts, or corrupted Windows components. To fix the issue, update QuickBooks to the latest version, run a full system scan, and reinstall missing payroll files. If the error continues, professional assistance can save time and prevent data loss. For immediate help and step-by-step troubleshooting, call QuickBooks Payroll Support at 1-888-394-9046 and speak directly with a certified payroll expert.