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