I solved. I re-installed Ubuntu 12.04.2 and I blocked the packages:
- linux-generic-lts-quantal
- linux-headers-generic-lts-quantal
- linux-image-generic-lts-quantal
from 3.5.0.23.30 to 3.5.0.26.33
I think that this packages have the bug. 
If I install this packages the bug appears, and if I remove after the problem 
can't solve. So I blocked they before the upgrade...

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https://bugs.launchpad.net/bugs/1153816

Title:
  computer freezes and/or report a GPU error message

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