DMA problem on drives

IMedia 1604 xp

DMA set to off on both drives, i think its something to do with six timeouts.
sound on cds and dvds bad. cant seem to find any menu to switch it on.
When ‘Dma if available’ is selected current transfer mode remains Pio Mode.
Anyone know?

Lite-On SOHD-167T 48x CD-ROM Player/16x DVD Player
Lite-On SOHW-1633S DVD±RW DL Drive

Uninstall the IDE controller in Device Manager, then reboot. It should re-set.