When you received your Windows 10 upgrade, Microsoft will have automatically provided you a like-for-like 32-bit operating system. But if you’d like to upgrade to the 64-bit version of Windows 10, you can – provided your hardware supports it.
Why upgrade? The 64-bit version enables you to use more than 3.75 GB of RAM, providing you with a faster Windows 10 experience. Moreover, 64-bit Windows 10 requires NX support as standard, gifting your processor another layer of protection from malicious attention. For more information please see the Hardware Specification section below.