I just installed the beta 182.05 nvidia driver and it solved my L4D stuttering problem. Every driver after the 178.34 driver caused stuttering in L4D. I read somewhere that most people with this problem were running XP like me, so it might help you out. It also gave me a slight boost in performance. Hope it helps.
------------------------------e6300 @ 2.62 - Freezer 7 Pro - 8800 GTS 640 @ 651/951 - ASUS P5B - Corsair XMS2 PC 6400 2gb - Audigy Sound Blaster
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