QuickBooks Error 3371 usually happens when a user re-configures the desktop computer or Activated the QuickBooks Desktop for the first time. Sometimes this error also comes due to the missing or damaged company files. The reason behind the error is due to Qbregistration.dat, damaged MSXML component, interrupted by Anti-Virus. This error can be caused by many reasons, to Error you can try some methods such as: Updating the Windows OS, Deleting the ECML file and Rename the Entitlement file, Install the latest windows updates, recreate damaged entitlement DataStore.ECML file. Fix Mircosoft.NET Framework, MSMXL, & C++ pitfalls by using QuickBooks Diagnostic Tool. Now update your QuickBooks to the latest version, and restart your computer. Still, facing QuickBooks Error 3371 and need help from an expert, contact us at 844-888-4666.