Your Windows 10 product key may be necessary to unlock all features -- but it's not easy to find. Here's where to look for the product key (even if it's lost).

Answer: Ah, the venerable Windows Product Key. That 25-digit alphanumeric prize that marks the difference between a legitimate copy of Windows, and one that Microsoft considers pirated. This ...

Can't find Windows 10 product key on your computer? Here are three easy ways to find your Windows 10 product key.