Why does my new iMac keep locking up running 10.7

Why does my new iMac running OS 10.7 keep locking up when I am on sites on the internet?

I think I might be in the wrong community here, but anyway. I have a new 21" iMac intel running OS 10.7. It locks up when on youtube as well as when viewing site on the internet. I have little knowledge in these matters. Any help would be helpfull.

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Why does my new iMac keep locking up running 10.7

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