This document provides troubleshooting steps for QuickBooks error 15271, which occurs when trying to update or install QuickBooks Desktop. Potential causes include an incomplete QuickBooks installation, corrupted Windows registry or files, or deleted QuickBooks files. The document outlines fixing the error by cleaning the QuickBooks installation in selective startup mode, repairing Windows components, resetting the update, and contacting technical support if issues persist. Taking a backup of the company file is also recommended before attempting fixes.