Why does my MacBook pro freeze and how do i stop it?

Hello
I have recently bought a new MacBook Pro, late 2011 13'' 2.4 GHz. It has started freezing alot. I don't know if it needs more RAM, a problem with the hard drive or faulty application. So I was just wondering if anyone could give me advise on how to stop it and why its happening.
Thanks

Is this very recent? Did you install the new Thunderbolt/Ethernet update?
Clinton

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I turned it on and I went to safari to look things up. Safari froze and then the whole thing became unresponsive - the mouse could move the cursor but it couldn't open any programmes.
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Why does my MacBook pro freeze and how do i stop it?

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