Let's see. You have got a new system card but with an 'old' sound system. It should work. I don't see why? I would try to see if I could get any good sound systems...brand new. That is what I would do. Nothing expensive, but not cheap.
I'd ditch the x-fi from creative - they got progressively worse after the 2ZS platinum. I loved it when it was still alive and judging from the speaker set you have, you've taken good care to make it last that long - so your somewhat of an audiophile and a moviephile?