Hey Batka_V,
Thank you for contacting National Instruments with your issue. Could you be a little more specific as to how you are configuring your system and what you want to do with it? It sounds like you have a PXI module, do you have a name and/or model number, that you wish to connect to your PC via ethernet. When you say that your PC doesn't recognise it, do you mean that it is unable to associate a driver to it or does it throw an error when initializing. If you could answer these questions, I will do my best to get you and your system up and running.
Regards,
Can Wong