This PC is working fine from the begining, the last week I installed the 6.6 catalyst, now I've decided to uninstall the 6.6, run driver cleaner pro and I've installed the 6.5, let's see how it works, the next hours.
I don't have temperatuer problems, the video card doesn't pass above 70Cº in full load, and CPU doesn't surpass 50Cº.
Thanks kirock, I'll check the links.