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When you fitted the PCI soundcard I assume you disabled the onboard sound in the BIOS settings to avoid a driver conflict? That being so, the onboard sound device won't be recognised by windows until you re-enable it the BIOS settings after first removing the PCI soundcard and it's driver.
As for the PCI soundcard problem itself, first check that the onboard sound is disabled in the BIOS. now boot into Windows and check Device Manager. If there is a yellow question mark against "multimedia audio controller" this means the driver is not installed. All I can suggest is you check for a new driver on the card manufacturer's website. The driver may have been patched or updated to address an SP2 compatibility problem. Such problems were common and affected many device drivers when SP2 was released.
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