thank you for help Babblearossa,
about the sound card driver: I've disabled it from the bios and i run game with no sound and the freeze happen in the same way, I think we can take out this possibilities..or not?
my prime95 tests don't exclude a bit the possibility of a phisical problem of the ram or cpus?(i don't overclock)
you know if there is a program to test/stress graphic card memory?

I try to reinstall game in the way you suggest me, and try more old catalysts..
thank you again