This usually indicates an IRQ problem. Under XP with ACPI turned on, XP will force all PCI cards to share the same interrupt. There is a hack to turn ACPI off on an installed XP system, but it usually causes more problems than it solves. The best way to turn ACPI off is to reinstall XP and when you get the the screen that says \"Press F6 if you have any third party RAID or SCSI drivers you wish to install\" press the F5 key. You\'ll get to a screen that will ask you what type of PC to install. Select \"Standard PC\" and go through the rest of the installation. Once you\'re reinstalled, if you still have problems, you can change the IRQ your sound card uses either in the BIOS or by moving it to a different slot.