well, you could just check the pump first, tyo make sure theres no blockages
next thing, is your machine plumbed in under the sink, attatched to the drain?
further to that, try a good old service wash
that being a 90 degree wash with no clothes in, possibly using calogon or such like, or some bleach
if you use bleach, be sure to do a couple of washes later to get rid of it fully
it sounds like the usual scenario, theres a useful guide on here, i cant just find it, im sure one of the guys (probably penguin) who will paste you the link
hope this helps?