Also, make sure Onboard Audio is disabled in the BIOS. I have seen cases where one OS will ignore onboard audio when a PCI solution is installed and others that will not. It could be causing a conflict. Try double checking that this is disabled. If you aren't sure how to access the BIOS, it usually involves hitting escape or one of the F1 - F12 keys upon rebooting your machine. Usually the bootup screen will tell you "Press F1 for setup" or something like that.