At first, you ought to know the precise reason for error 3371. It can occur thanks to a missing or corrupted file, which is otherwise needed to run QuickBooks. Also, damaged MSXML file, outdated Windows, and antivirus software plays a considerable role in causing QuickBooks error 3371. To fix it, you want to update your Windows to the newest version by following these steps – click Windows/Start icon on your computer, then select All Programs from the list and click on Windows Update. If the difficulty persists, then you'll got to re-install the QuickBooks program employing a clean install tool available from the QB website. Moreover, you'll also contact the QB experts to repair the error.