Ian over at Designtechnica has posted a story on a recent wild goose chase that he went through with tech support at Creative Labs. Turns out the Audigy 2 ZS that was in his Compaq was not a standard part, but rather an OEM model. I've personally seen this exact thing before, where Creative puts cards with different model numbers than the retail cards into OEM PCs. The problem is that these cards don't use the same drivers as the retail cards, which can be quite frustrating. In my case, however; I was able to find the correct driver more easily from Dell's support site.

"If you remember, I reviewed a Compaq GX5000Z gaming system last November. This is a desktop system developed by Compaq that uses standard retail computer parts; the very same parts you can purchase at your local computer store. Nothing is integrated, and the system uses an MSI motherboard (K8N Neo 2 Platinum) which you could purchase yourself should you so desire."