Nero 6 has it's own ASPI layer so you should not require any other ASPI layers to burn. You can check to see if ASPI is installed correctly by using Nero Info tool (Nero Toolkit) under the ASPI tab then select Nero ASPI in the drop down list. It should say "ASPI is installed and working properly". See the enabling DMA link in my signature to check and see if you have your DMA properly set up on your PC.