Disabling DMA helped, and I managed to update my firmware. Thanks.
However, I'm still having problems burning audio cds with Nero. When I use the Adaptec plugin that comes with media player 7.1 to burn audio cds, it works, but it cuts off the last 2 seconds of audio from each track. Also, when I use Nero to burn data cds, the burner cannot read the cd, as it cannot read the TOC, but when I use the cd on any other computer, it can be read. Any solutions? Thanks.