Nvidia uses something called NVIDIA® ForceWare® Unified Driver Architecture.
It transalates to: there is only one driver for the FX and series 6. ie. The same driver suffices for 6200, 6600 and the like. Basically, common drivers.
Follow vimal's link or go to this page *www.nvidia.com/content/drivers/drivers.asp and in the form feilds choose:
Graphics drivers> Geforce and TNT2> your OS