DMA is enabled but does not display as per the link you sent as my motherboard is using the nforce 2 drivers (displays as NVIDIA Nforce 2 (tm) SPP/IGP ATA Controller). Clicking properties Primary channel DMA diaplays as "Ultra DMA 6 - Ultra133" and Secondary displays as "Ultra DMA 2 - Ultra33".

When i started having problems i only installed a second burning application (Ashampoo burning studio) as a test and removed it when i discovered it made no difference to my burning results. Also ran registry mechanic to remove its left over registry entries.