but how would i make it figure that out
A quick check in the bios, and make sure that the onboard audio is disabled.
Just in case this is the driver you need, Creative Sound Blaster audio driver 1.04.0090
After downloading use something like Winrar to extract the downloaded file. Once extracted open Device Manager, go to the multimedia device, right click on select "Update driver". Then,
1. select Browse my computer
2. select "Let me pick'
3. click on "have disk"
4. click on Browse and find the extracted folder and point it to the folder that contains p17.inf, will look like this,
Assuming the unknown multimedia controller is your Audigy that should get the driver installed. Give it a try and please report back whether it worked or not.