JPGs are "noisy" on Mac, but not PC

Hi all!
I got a new hybrid camera that I've been playing with. When I load the pictures on my Intel iMac, anywhere there is a dark or black area, it looks very noisy.
Best I can describe it is speckled, colored pixels.
This happens in Preview and iPhoto.
Now, when I look at the same exact pic on a PC, it looks fine.
Is it possible that it's using a version of JPG that the Mac is interpreting differently? Is there something I can set on the mac to get rid of, or lessen, this?
I know the iMac has way better resolution, video card and display than my PC, but I can't imagine it'd make this big of a difference.
When I get home I'll reboot in XP on the iMac and see if it looks the same, but until then does anyone have any ideas?
Thanks!

The noise level could have something to do with the quality or ISO settings on your camera.
A higher ISO setting introduces noise - I usually use ISO 50 but also ISO 200 for pictures where the light isn't perfect. The ISO 200 shots are always noisier.
One camera seemed to revert its quality (could have been user error too) to the middle ("fine" on a Canon is such a lie. They should call the quality settings "bad", "acceptable" and "good" instead of "normal", "fine" and "super fine") and that introduces noise as well.

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JPGs are "noisy" on Mac, but not PC

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