I was having the same ambient noise problem being much much louder than anything else in the game, including dialogue with Kate inside a building 30 stories up, and I played with the Hardware Acceleration settings in the Windows Control panel and that did help. The problem with that is that it slowed things down a bit, and Skype wouldn't work at all. I do not have the K-lite codec pack installed, nor do I have the CCCP codec pack installed either.
I would recommend checking to see if your soundcard manufacturer has updated their drivers. I'm running a 2.2Ghz MacBook Pro 3,1 (Santa Rosa) and the built-in soundcard is a RealTek ACL885. I checked the RealTek website and they just released version R2.14 of their HD Audio Codec drivers. I installed them and have had no problems with the ambient sounds with the Hardware Acceleration set at full.
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