Since this question hasn't been marked closed or answered, I'd like to offer some input.
Services for Unix (SFU) Applications is available from Microsoft, and appears to support all versions of MS Windows - however the installer does warn that there are compatibility issues with Vista.
My efforts to use SFU (explicitly for NFS services) have repeatedly failed, despite having meticulously followed several guides.
If there are any lingering MS Vista users attempting to achieve NFS server capability, you'll have a significantly easier time installing FreeBSD.