Sound not working in Windows 7 64bit

I have an early 2008 macbook pro and I was previously running the 64bit Windows7 RC and the sound worked perfectly well. I did a clean install of the RTM Windows7 Professional and I haven't been able to get the sound to work properly. When I boot into windows there is a red light from the headphone jack and I've tried using boot camp 2.0 drivers as well as the 2.1 drivers for vista 64bit and neither makes the sound work.
I did notice that if I plugged in my external speakers and put the volume at the maximum that I could hear very minimal sound, but nothing from the built-in speakers.
I checked the drivers and windows says that the drivers are all up to date and that they are working normally. I even tried erasing the partition and re-installing windows and the result was the same.
I've looked online and have tried several different suggestions but none of them seem to work. I thought perhaps that the bootcamp drivers didn't like windows7 since the RC was considered by most software as a version of vista, so I tried using vista compatibility mode but it still didn't work.
Your help would be appreciated.

I had the same problem. I solved it by using the driver at this link
http://www.realtek.com.tw/DOWNLOADS/downloadsView.aspx?Langid=1&PNid=8&PFid=14&L evel=3&Conn=2

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