Changing OS Bitness: Windows OS license will activate both 32-bit and 64-bit versions. Please refer to Is a Windows 7 license key valid for both 32-bit and 64-bit?.
Downgrading Windows OS: If the controller is now sold with a newer version of Windows, but there exists an older PXI Platform Services version compatible with it and with the Windows version you are downgrading to, the controller can be downgraded and will work properly provided you install the appropriate version of PXI Platform Services and Peripheral Drivers.
Upgrading Windows OS:
Windows 10: Controllers installed with Windows 7 that have compatible chipsets for Windows 10 should be able to support Windows 10. To check what chipset your controller has, check the processor compatibility in Does My Intel® Processor Support Microsoft Windows® 10?. In general, NI does not provide support if you do choose to upgrade these controllers. Please call NI to determine if we support the upgrade for the controller. If you decide to do this, be sure to download the appropriate Windows Peripheral Driver from the link at the beginning of this article.
Windows XP and Windows 7: In situations where you are upgrading to Windows XP from a previous upgrade, it may be beneficial to reach out to NI Support before continuing to ensure that the products have not reached end-of-life (EOL), as they may no longer be supported.
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A valid service agreement may be required, and support options vary by country.