The 1500m is not supported by the 173.14.28 driver. Also, it's not one of the older GeForce 5 FX cards. The chipset is the same one used in the Go 7900.
Don't know about the 1500 specifically, but have used the 173 driver on geforce 6600, 6800, 7600, and 8600 cards, with better results than the "GeForce 6100 or later" option, that loads the current 260.xx driver. The nVidia driver recommendations have a tendency to be a bit overly optimistic when it comes to anything but the current latest and greatest cards. Sometimes it pays to experiment.