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Installing Sage on Windows relies on Cygwin.

Anti-virus software can interpret Cygwin's low-level calls as malicious.

The recommendation is - download the SageMath installer for Windows - tell your anti-virus to consider it harmless - run the installer, which installs SageMath - tell your anti-virus to consider SageMath harmless - maybe tell it to consider the underlying Cygwin as harmless too - then run SageMath

Silent destruction of parts of Sage by anti-virus software has been observed and can lead to this kind of error.

Installing Sage on Windows relies on Cygwin.

Anti-virus software can interpret Cygwin's low-level calls as malicious.

The recommendation is - is

  • download the SageMath installer for Windows - Windows
  • tell your anti-virus to consider it harmless - harmless
  • run the installer, which installs SageMath - SageMath
  • tell your anti-virus to consider SageMath harmless - harmless
  • maybe tell it to consider the underlying Cygwin as harmless too - too
  • then run SageMath

Silent destruction of parts of Sage by anti-virus software has been observed and can lead to this kind of error.