NFS = Network Files System, which in a nutshell is a way to access files over a network.
en.wikipedia[.]org/wiki/Network_File_System
The NFS client is one of the optional features that can be added to Windows, and just as easily removed... Control Panel -> Programs and Features -> Turn Windows features on or off. It won't cause any particular harm, but it's something that does increase the attack surface, being a priority target for cybercriminals, malware etc. Over the years there have been a steady stream of NFS vulnerabilities found & patched. And of course if you're running Win7, no fixes have been available for a while now.
The NFS-related files added to my Win7 32-bit VM;
C:\Windows\System32\drivers\en-US\nfsrdr.sys.mui 4KB A 7/13/2009 10:06:34 PM
C:\Windows\System32\drivers\nfsrdr.sys 202KB A 11/20/2010 1:44:14 AM
C:\Windows\System32\drivers\rpcxdr.sys 88KB A 4/24/2019 10:45:45 AM
C:\Windows\System32\mount.exe 41KB A 7/13/2009 9:14:25 PM
C:\Windows\System32\nfsadmin.exe 48KB A 7/13/2009 9:14:25 PM
C:\Windows\System32\nfsclnt.exe 53KB A 11/20/2010 5:17:24 AM
C:\Windows\System32\nfscprop.dll 64KB A 11/20/2010 5:19:52 AM
C:\Windows\System32\nfsnp.dll 60KB A 7/13/2009 9:15:46 PM
C:\Windows\System32\nfsrc.dll 8KB A 7/13/2009 9:15:46 PM
C:\Windows\System32\nfswmiprov.dll 79KB A 11/20/2010 5:19:52 AM
C:\Windows\System32\rpcinfo.exe 49KB A 11/20/2010 5:17:24 AM
C:\Windows\System32\showmount.exe 34KB A 11/20/2010 5:17:24 AM
C:\Windows\System32\umount.exe 37KB A 7/13/2009 9:14:25 PM
Adding the NFS client causes a lot of registry churn, more-or-less rewriting one of the hives, but the app itself only relies on a single entry for the key under HKLM\ Software\ WOW6432Node\ [for the most common 64-bit Windows]. All added files are in the app's folder.