If you're looking to upgrade your onboard sound (and you should), the
DIAMOND Xtreme Sound 7.1 is an option worthy of consideration. Find
out how it compares to Realtek onboard sound, and an Asus Xonar
Phoebus soundcard that uses a similar chipset.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips