Sony dvd not burning copys of dvd,s well

I have a laptop latest spec, 1g memory etc, i have a sony rw dw q58a, i have nero 7, and the latest filmwere on my drive. i am using dvd decrpter last version, and am using DVD+R 4.7 GB 16X Taiyo Yuden. I have no problem ripping or burning but the copy is qurky or freezes up can any one help .