well, you could get one of those PCMCIA audigy 2 card:
http://www.creative.com/products/product.asp?category=1&subcategory=204&product=10769
then plug your speakers in it, it supports 5.1 and 7.1 on real speakers systems (it's what they say on the site) plus, you get WAY better sounds quality/performance then your current one
http://www.creative.com/products/product.asp?category=1&subcategory=204&product=10769
then plug your speakers in it, it supports 5.1 and 7.1 on real speakers systems (it's what they say on the site) plus, you get WAY better sounds quality/performance then your current one