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If it's the graininess in the shadows you're talking about, this is usually solved by raising your sampling quality and/or changing the shadow type and parameters. It looks like it might be using mental ray, so go into your 'Renderer' tab and increase the samples per pixel (1/4 and 4 are my defaults here). Try increasing that to 1 and 4 or even 4 and 16.
Also, depending on the type of shadows you are casting, try using Ray Traced Shadows or Area Shadows. As Tim said, it's important to know which renderer, shadow type, and lights you are using and what they are set at.
EDIT: and on top of this, it's also important to know what you're going for overall heheh :)
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