Shiromagius did you read the above post??
The only advice I can think of is....
a - if you have onboard sound, ensure ALL onboard options are disabled in the bios
b - Try allowing the bios to control your system resources as opposed to your operating system.
c - uninstall your sound card, uninstall ALL drivers for the soundcard, and ensure no "leftovers" are left in the registry.....then reinstall the sound card and DO NOT use the XP drivers - use the ones from the webpage
Hope that helps you out