The NVIDIA drivers most widely accepted as stable with Secret World Legends at this time are 436.15 and anything at or below 425.31.
While some people experience instability at 436.15, there are more reports of drivers between 425.31 - 436.15 and after 436.15 leading to SWL crashes.
425.31 and anything below is stable for almost all players. If you want certainty and can afford to roll back that far, that is your best bet.