QuickBooks Error 3371 is a common issue encountered when launching QuickBooks, typically indicating a problem with the software's license information or installation files. This error may be caused by corrupted files, outdated software, or incorrect system settings. To resolve it, you may need to update QuickBooks, repair the installation, rebuild your data file, or check for missing license information. Following these troubleshooting steps can help restore normal functionality and get you back to managing your finances smoothly.