Boot Camp - audio coming from headphones AND internal speakers

Am not sure how prevalent this problem is. I've got XP Pro running on my iMac 20", and am guessing I've got a glitch in boot camp's windows audio drivers.
Normally, when you plug your headphones in, your audio signal is supposed to be routed to them and your internal speakers would be muted. On mine, however, only in XP, plugging in the headphones does indeed cause audio to come out of the headphones, but it does not mute the internal speakers. Basically, I can't stop the audio from coming out the internal speakers without muting everything.
I've gotten no help from Windows volume controls, and unlike on the Mac OS side, there isn't a separate volume setting when the headphones are unplugged.
Anybody see this besides me? Anybody find a solution that'll save me the time of waiting for a new audio driver?
Thanks in advance!

no new drivers to download. However, the latest Firmware update at least auto-sets the internal speakers to a lower volume at startup (instead of full volume)

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