I have a sony vaio with dvd burner. It was copying dvd's fine using nero recode or dvd shrink, but then I started having problems. Invalid block address during burning, thus ruining my dvd+r's. I saw a thread with the similar problem but it was old and didn't show the answer to my problem. I did try to use the links provided for driver-clean tool which did nothing and registery check which disabled my dvd43. which I then had to reinstall and I accomplished nothing. please help.