Top bar and dock pixelate iMac lion

I recently upgrade to Lion and after that everytime I click for example to open MACHD and view in list view it start to look pixelate and also the top bar and the dock where my shortcuts are
any Ideas

Thanks so much. The control key with the scroll worked. I figured it was a simple fix but for a new mac user the obvious doesn't come natural. I wont forget this one. Thanks again!

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