XP reverts to on-board sound

Hey all,

On my studio pc, I've installed a new rack mounted firewire audio interface in the studio. On the other drives (windows 8.1) the interface has installed perfectly but on the xp drive, although the drivers etc have been installed, once set, it works perfectly with the new outboard soundcard.

However, whenever I reboot to the xp drive, xp always reverts back to the on-board realtek sound card. I set the default to the new interface (a Presonus Firestudio Project) but every reboot it defaults to the realtek.

The motherboard is a P5N-E SLI if that helps.

How can I stop this happening so the new interface is the default?

Thanks in advance,

Paul
 
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