I have to communicate with a CNC that uses Netbeui. I have successfully added the XP Netbeui files to W7 and installed the protocol on several machines but the last time I tried it would not work. The files NETNBF.INF goes in Windows\INF and NBF.SYS in Windows\System32\Drivers. In the past I could then add the protocol but on this PC it does not appear. I've tried logging in as Admin etc but to no avail - any ideas?