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Based on effectiveness, safety, and legality, purchasing a genuine product key scores the highest. Workarounds and third-party tools for activation without a key score low due to risks and potential violations of terms of service.

While there are methods to activate Windows without a product key, the risks and potential downsides make purchasing a genuine product key the best course of action for most users. Not only does it ensure full functionality and support from Microsoft, but it also adheres to legal and ethical standards.

If you use Windows every day for work or gaming, buy a legitimate OEM key (they are often $15-$30 from reputable third-party resellers, not Microsoft's $139 price tag). It removes the watermark and ensures you get all security updates and personalization features.