Some customers have reported error 209 when launching or running TurboTax.
Uninstall and then reinstall TurboTax.
If that doesn't help, delete the TYXX folder (replace XX with the 2-digit tax year) by right-clicking it and choosing Delete. The path to this folder is C:\Program Files\Common Files\Intuit\TurboTax.
Then, forcefully uninstall and reinstall TurboTax.