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Resolve Error 1601, 1603 and 1642

Learn how to troubleshoot Error 1601, 1603, and 1643 when installing or updating QuickBooks.

When installing QuickBooks or doing a product update, one of the following error occurs:

  • Error 1601: Windows Installer is not accessible
  • Error 1603: There was a problem installing Microsoft .NET Framework [version]
  • Error 1603: The update installer has encountered an internal error
    Error 1642: Error installing Microsoft .NET Framework when installing QuickBooks

These errors can be caused by a damaged Microsoft Windows Installer or a damaged QuickBooks Desktop installation.

To resolve the error, try one of the following solutions

If you get the error while installing QuickBooks: Repair or reinstall Microsoft .NET Framework.

If you get the error while updating QuickBooks: Reinstall using a clean install.  Make sure to use the link from our downloaded page instead of the CD installer.

Note: If you are not comfortable doing these steps on your own or if the error persists, contact your IT professional or Microsoft support.