When installing QuickBooks Desktop or 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 1642: Error installing Microsoft .NET Framework when installing QuickBooks

Error 1603: The update installer has encountered an internal error

This error 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.

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

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.