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

• Windows 11 comes with .NET Framework 4.8
• Windows 10 comes with .NET Framework 4.6
• Windows 8 comes with .NET 4.5, with automatic updates

Troubleshooting

If you encounter errors or other problems with .NET, download and run Microsoft's .NET Framework Repair Tool.

If that doesn't resolve your issue, run the System File Checker and then open Control Panel and choose Programs and Files. Open .NET Framework 4 and select Repair.

If the issue persists, download and install Microsoft .NET Framework 4 from Microsoft's site.

Windows Installer numerical errors

If you receive a 4- or 5-digit Windows Installer error, we have specific help articles for your situation.

• 1327: Windows Installer cannot write to the specified drive
• 1601: Windows Installer service could not be accessed
• 1603: Fatal error during installation

Other errors

If you're not experiencing a specific error, here are some general help articles that might be useful:

• TurboTax is already installed