Ambient Occlusion in L4D 2

How can i get my ambient occlusion to look better, it doesn’t seem to be working right.

Intel core I7 920 @ 3.02 Ghz
EVGA X58 motherboard
EVGA GTX 285 2GB
12 GB Corsair Dominator DDR3
2x 750GB WD 7,200 RPM drives in RAID0
1200w PSU

EDIT: after searching, all i could find was that it is interfering with smoke particles and the only choice is to turn it off in the Nvidia control panel. :frowning:

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