If you are getting QuickBooks error 3371 on your system, then there are chances that your QuickBooks licence data has been damaged, missing, or corrupted. To resolve the problem, you need to delete the " ECML"  file and rename the " entitlement" file. Also, upgrade your Windows operating system to its latest version available. If this does not help you out,  download the " QuickBooks tool hub" on your system and use the " quick fix my program"  option to resolve the issue.  Hopefully, after this, your problem will be resolved. If the error code is still showing, contact the QuickBooks support team and get instant professional assistance to resolve the issue.