Here’s how to fix TurboTax not starting with Windows Installer Error 1334 on Windows:
1) Uninstall TurboTax 2025 from Settings > Apps > Installed apps. Then, uninstall TurboTax (Windows 10/11)” and remove leftover TurboTax folders, then reboot.
2) Run Microsoft’s “Program Install and Uninstall troubleshooter,” then try install again. Open Command Prompt (Admin) and run: sfc /scannow; reboot when done.
3) Download a fresh installer from your TurboTax account (Advantage > enter license code > Downloads), then run the installer. Right‑click the installer > Run as administrator. Temporarily disable antivirus/firewall during install; re‑enable after.
4) If you’re on Windows 10, use TurboTax Online or upgrade to Windows 11.
5) If you still experience issues, try launching TurboTax as admin. If it immediately closes, check if Windows flagged the executable; advanced fix involves removing a bad Image File Execution Options key for turbotax.exe (only if comfortable editing the registry).
If the error happened during an update (not first install), manually apply the latest TurboTax update package and then relaunch.
If you still experience issues, Contact Us
