Grainy, pixelated photos in Photoshop and ACR

All my photos in Photoshop and ACR look very grainy and pixelated on my new Macbook Pro? How do I fix this? I have already updated everything and installed the plugin for my raw files. Any help is appreciated!
Using Photoshop CS5

Check Preferences > Performance > Cache levels.  It needs to be set to a value higher than one.
If that does not help, can you tell us what camera these RAW files come from.  If a Nikon, have they been processed in the Nikon bundled software?

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