My computer freeze the screen oftelny

Hi, i have installed the new Mountain Lion, in a 1.7 i5 with 5GB DDR3 MacBook Air.
Since i've made this upgrade, i've get a frozen screen, and only my mouse works. Today i've had this problem more than 4 times in less than 4 hours.
I need a solution: restore to previous OS or fix this...

no, i think i have, but i prefer to use the new OS, i like new updates, but i have this ****** frozen problem... i prefer to get a solution for that instead of downgrade my OS.

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