MillenX and Prober, thanks again for your help. I've solved my problem - restart in WPI before Nero silent install did the job - now everything works well. It seems that MillenX was right, it must be that Nero ask a restart, and without that, installation breaks. BTW, I think that MillenX's method of unattended install is best of all out there, because there is no modification of original setup files in any way, and I hope it could be used with next versions of Nero. Great work!