Windows 10/11 receive security updates, have built-in antivirus (Defender), and support modern hardware.

One of the most important technical distinctions to make is that

If a tool asks you to disable your antivirus, run away. No legitimate software ever requires that.

Many "KMS activators" found online for Windows 7 Ultimate are unofficial third-party tools (like KMSpico or Microsoft Toolkit). Academic and security papers often analyze these as "riskware."