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While Windows Defender is built-in, pairing it with a reputable, lightweight third-party antimalware tool adds an extra layer of defense.

This article is for educational purposes. Microsoft officially ended Mainstream Support for Windows 8.1 on January 9, 2018, and Extended Support ended on January 10, 2023. Using an unsupported operating system carries significant security risks. windows 8.1 download 64 bit activated

Here is the safe path forward: