Finding drivers these days for these Multimedia Pro cards is quite difficult, since Packard Bell no longer host these on their server, nor does Aztech Labs.
However, I've been able to track down various drivers over the years from other sources.
Unfortunately, in the case of this model (I38-MMSN837), I'm not entirely sure which one of the Multimedia Pro driver sets is for this card but, it should be one of these two that I've attached below. Both of these has support for the 3D surround sound function.
I'm inclined to say that the MP163D6 driver set is probably the one.
Try installing the first set first and see whether the installation program recognises the card. If not, try the other set.
If the first one works, try the other one as well, as I would like to establish which of these driver sets actually does work with this particular model number.