It's still correct to use the vapor barrier- which is to block
moisture from warm, heated space penetrating and condensing in cold,
unheated space, causing problems there. However, you still need to
solve your moisture intrusion problem from outside, which is not always
easy, or cheap. First, though, be very scrupulous in making sure all
drainage is directed away from foundation. Take a look outside that
area of previous leak and see if you can't improve things somehow,
alter slope, extend leader, etc.