Nero 7, two "hang" problems

I’m running Nero 7 latest, basic installations and no incd, on Intel c2d 6300 and a via chipset Asus mobo. DVD is Benq 1650

Problem 1: I can’t write double layer dvds, Nero always freezes my pc somewhere near the middle.

Problem 2: When i ABORT verification of a DVD, Nero freezes also my pc and i have to reboot.

Any ideas ?