TurboTax FAQ
TurboTax FAQ
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Troubleshooting and Repairing Problems with Windows Installer and the Microsoft .NET Framework

The Microsoft .NET Framework helps software developers create applications quickly, efficiently, and with less "code clutter". More info

Because TurboTax for Windows relies heavily on the .NET Framework, it's crucial that your .NET system files are up-to-date and functional.

TurboTax for Windows 2016, 2017, and 2018 require .NET Framework 4.5.2; and  2015 versions require Microsoft .NET Framework 4.0 or 4.5.

  • Windows 10 comes with .NET Framework 4.6.
  • Windows 8 comes with .NET 4.5, with automatic updates.
  • Windows 7 and Vista come with .NET 4.0, with automatic updates.


If you encounter errors or other problems with .NET, the first thing you want to do is download and run Microsoft's .NET Framework Repair Tool.

If that doesn't resolve your issue, run the System File Checker. Then, open Control Panel and choose Programs and Files (or Add or Remove Programs in XP), locate the .NET Framework 4, double-click it and then choose Repair.

Hopefully that should take care of things. If not, visit Microsoft employee and .NET expert Aaron Stebner's WebLog and carefully (we cannot emphasize this enough!) follow his directions to download and run the .NET Framework Cleanup tool. When finished, download and install .NET Framework 4 from Microsoft's site.

Windows Installer Numerical Errors

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