[2013-04-26 20:10:35] GPU #0: with compute capability 716.25
See, it can't even open your GPU. No name indicated and compute capability is bogus.
Try updating your driver. It must be new enough to support CUDA 5.0.
thank you and to all the others, I solved installing latest 314.22 nvidia driver!

now I see
[2013-04-26 22:10:48] GPU #0: GeForce GT 430, 81408 hashes, 18.13 khash/s
same speed of cgminer but it's ok!