You should have no problem whatsoever with Microsoft basic IDE drivers with the KT266A chipset.
I own a KT266 boards myself (MSI KT266Pro), with a Pioneer 109 drive on it and everything is fine with the MS drivers, UDMA mode 4.
Maybe you already installed, once, a VIA 4in1 package and this could be the reason why you have this problem, this is a well-known issue on these forums that the Via IDE drivers don't do a proper job for DVD burners.
Anyway you'll have to uninstall these "Accelerated drivers" that are not supported by your mobo.
How are all your IDE drives connected? i.e.: