Need NFS Server for Windows 7/8 so that I can access it from ESXi

Need NFS Server for Windows 7/8 so that I can access it from ESXi  that I have running on VMware Workstation.  I've tried FreeNFS, but it  doesn't seem to work right.  I can get ESXi to take it, and I can create  files on it, but when I try to add a VM to inventory it comes up with  unknown.  invalid.  When I go there via SSH, and to an ls, it shows the  files, but returns unknown when I type pwd, so there is something not  right there.  Anybody know of a good NFS Server for Windows 7/8 that works for this?

Thanks!