Photoshop images are grainy when I view/edit them

I have used Photoshop CS3 for a year now with my 15-megapixel DSLR camera and used to be able to edit photos in PS just fine. But about 2 months ago I upgraded to CS4 and since then, all my images are super grainy when viewing and editing them in PS. I know it has nothing to do with the way I'm saving the images as they show grainy in photoshop before I even do anything to them. And when uploading them online, they're still super grainy even though they weren't before back when I was using CS3
Anyone have any idea why?

Well, that's the thing. The camera settings are the exact same as they were when I was running CS3 when everything was fine. The only variable that changed was installing CS4. After I did that, even though the camera settings DID NOT change, the images all of a sudden became grainy
I thought it may be a hardware issue so I upgraded the video card to one that greatly exceeds the requirements, but still no joy. I also did the Ctrl+Alt+Shift method to clear settings in case there was a rougue setting somewhere that was causing it. Still no luck

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The !turns up when iPhoto loses the connection between the thumbnail in the iPhoto Window and the file it represents.
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Photoshop images are grainy when I view/edit them

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