DVD drive problem - DMA

Okay, first off, I did try everything I have knowledge of before I resorted to ask for help.

I recently built a new computer, everything works fine except for one thing, I can't enable Ultra DMA 4 on my DVD drive. (PIO transfer mode works fine.) When I enable it by having Windows uninstall and install my secondary IDE controller, explorer crashes and reverts to PIO. I checked the jumper setting on the DVD drive, it was set to master (It's the only DVD drive in this PC, and on the second IDE controller.)

There's nothing I can do, and burning/reading DVDs is really slow and makes everything lock up if I'm doing anything else ;_; Please help, and thanks for any replies.

My epeen (specs):
ASUS K8N-DL nForce 4 motherboard
Dual AMD Opteron 242
1GB ECC RAM
DVD drive - LITEON SHW-160P6S
GeForce 7300LE (If it matters...)

>>19

I checked them, they're Micosoft's drivers, actually. It says "Driver Provider: Microsoft" I tried "Roll Back Driver", it says the drivers were not changed. I check "Driver Details", looks like it's Windows.

And, USB will help my speeds, there's no bottleneck, because 12x doesn't go past 50MB/s.