I Have A Dell Inspiron 8200 Laptop with Windows XP Home Edition

I use Nero 6.6 to burn and it keeps giving me a write error i tryed to turn the speed down 4 different ways it still dosent work and i also reinstalled windows and i know it's not the brand of the blanks because it used to burn everybrand i bought at 24x now it rarely completes a cd at 4x with the write error popping up.