Well the way i see it instinct is a pattern of behaviour, like the way a beaver knows how to build an efficient dam in a stream or lake. but drive is the motive force that, well, drives the beaver to perform this or that or the other instinctive pattern of behavior.
so a beaver can be driven to build a dam, to chew on a tree to fell it, to mate with another beaver etc., but those are all the patterns that mould the energy of the drive.