TurboTax FAQ
TurboTax FAQ
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Error 1603: "A fatal error occurred during installation or updating"

Error 1603: A fatal error occurred during installation or updating may occur in TurboTax for Windows.


Possible Causes

This error can occur when the Microsoft .NET Framework Installer cannot install and/or update your system. Possible causes include:

  • Damaged Windows file and folder permissions
  • Damaged Windows Registry key permissions
  • Damaged Microsoft .NET Framework installation

If error 1603 occurs while updating TurboTax, your best bet is to download and install a manual update.

If error 1603 occurs while installing TurboTax (or in other situations), it may be related to the .NET Framework. See our comprehensive article on Troubleshooting Problems with the Microsoft .NET Framework for more help.

Note: We also suggest using Windows Update to ensure that your operating system is up to date, as this may help to resolve a 1603 error.