Hi Tom,
Why don't you just temporarily unplug your computer from the network and plug the cRIO directly into your computer. If you do this you will have to use a crossover cable and give your computer a static IP address.
The other way you might be able to do it, note I haven't tested this, is to a USB to Ethernet Adapter. If you do this you may need to disable your network card anyway... so you might as well go for the first option.
Rico P