Additional Information
Common causes and solutions to error 1601 are:
If you are experiencing this error in Windows in safe mode:
Microsoft Windows automatically disables the Windows Installer Service when in Safe Mode. The NI uninstaller depends on this service to successfully remove NI software. To proceed with uninstallation, enable the
Windows Installer Service.
If you are not in safe mode:
Contact Microsoft Technical Support
Note: Be sure to check the exact operating system in the list of compatible operating systems to ensure you are downloading the correct version of Windows Installer. Previous versions of Windows Installer are also available on the Microsoft website.