When I was testing on my home, I wanted to mount something to Windows 8 which I created at storage but I couldn’T do it. When I made a brief search for it, I went onto something.
I have to say this, Windows 8 Professional users are not able to use NFS service. Thats why you cant activate that service. As Microsoft says about that :
Services for Network File System (NFS) feature is available only in the Windows 8 Enterprise edition. This feature is not available in Windows 8 and Windows 8 Pro editions.
Also, you can reach detailed info on the link below.
But if you still want to use NFS client on Win 8 PRO, you can visit the link below.