One of the most critical errors that are encountered by many QuickBooks users is the QuickBooks Error 3371. It usually occurs when a user re-configures the desktop computer or activates QuickBooks for the very first time. This error can be easily fixed by installing the latest window update, and after that installing QuickBooks once again. Advanced troubleshooting options include recreating the damaged EntitlementDataStore.ecml file, or fixing the Microsoft.net framework using the required diagnostic tool.