Windows 7 NXT Fantom Driver and NXJ Issues I have informed Lego about the issue with their download a while ago, but nothing seems to Later, when I was installing the actual Mindstorms NXT 2 software from Official Fantom driver download is broken. If you try to install the Lego NXT-Fantom Driver (which is necessary to install Lejos to NXT-Mindstorm-Bricks), and you just downloaded the. In order for your computer to communicate at all with the NXT, you will first need. Lego's "Fantom" driver. 1. Go to #.