Please help with DVD drive problem

Is the problem gone when you go back to the old memory configuration?
Is the dvd-drive listed as "dma" in device manager?
(rightclick "my computer" - properties- hardware- device manager. Expend ide controller and see if they are both set to dma in their properties)
Are those sticks of the same speed, both pc2700 or pc2100?

Mmmm, try to force it to dma mode, and restart the pc. dma mode is the option to get, it means direct-memory-acces and is really needed for fast data streaming. One other thing (but mostly it is solved by the pio-dma change), could also be the ide-driver, most computermakers add their own, but usually the microsoft ones work better. Might want to check your dual channel ide controller for that. Should be listed next to the primairy and secondairy one. If you need the microsoft one, choose update driver and let windows do a suggestion.

You are welcome.
Try if you can do a driverupdate and choose the option to pick one from a list, (display a list of drivers for this device and choose one from it)? What driver is the dual channel controler using now?
Odd that it can't be put to dma-mode, coz that is the normal mode for dvd drives for a . Have you checked the bios configuration, is the drive not restricted by the setting there? (F10 on post I guess).
Maybe you should uninstall those players, and start from scratch. It could be programs disturbing eachother, likely with ones that have disc detectors loaded on startup of the computer.
Another option is to remove the drives and ide controllers from hardware manager, restart and let it reinstall.