I uninstalled my gfx drivers and NL ran ok on default settings. I then changed some NL gfx settings, resolution, detail etc and now problem has returned.
Installed NL 1.6 on Win7 x64 and it started ok, loaded a track that came with it and it ran fine for a minute then froze. So I installed the 1.7 update and when I load NL I just get a black screen and PC stops responding and I have to reboot. Uninstalled, tried 1.6 again still black screen problem, ...