IMac headphone jack nonfunctional in XP (Boot Camp)

I recently installed Windows XP Home SP3 on my late 2008 iMac 20". I installed the Boot Camp drivers from a recent retail Leopard DVD, Boot Camp is version 2.1. Today I discovered that the headphone jack doesn't work. I plug in headphones, and sound continues to be played through the system speakers. These same headphones in this same jack DO work as expected in Mac OS X.
I have noticed in the Realtek HD Audio Manager, when I plug the headphones into the headphone jack, the "Line In (Realtek HD Audio Input)" icon lights up instead of the headphones icon (looking at the Audio I/O tab). If the driver was confusing the line-in jack with the headphone jack, as this observation indicates, it would explain why no sound is getting to the headphones.
The only relevant KB article I could find was this one relating to the MacBook Pro: http://support.apple.com/kb/HT3588 , however it seems to be addressing Windows Vista (it doesn't specify), and in any case I don't have an MBP. I cannot find any place in XP or Realtek's software to choose between internal speakers and headphones or to disable either.
I am going to try installing the latest drivers from Realtek's website, but I am curious if anyone else is experiencing this problem.

I can confirm that the latest Realtek drivers do not fix the problem. I unstalled the Realtek driver and software via Add/Remove Programs, rebooted, and installed the newest version. It still recognizes the headphone jack as the line-in jack, and ignores the line-in jack altogether.
The Boot Camp driver version was 5.10.0.5713, the driver I downloaded today from Realtek is 5.10.0.5874. I found the drivers here: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PFid=24&Level=4& Conn=3&DownTypeID=3

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Message was edited by: joudbren

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IMac headphone jack nonfunctional in XP (Boot Camp)

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