If I enable UDMA (which I can only do by loading the latest VIA IDE driver on its own - loading the 4.23 service pack doesn't do it!), I find Windows 98SE keeps telling me I have ejected CDROMs which results in a Blue screen, and then illegal operations of various types. I have a UDMA 66 Diamond Max drive & an 80pin cable. CD's included: Creative 52x, Pioneer DVD, Delta 48x, Memorex 48x. New mbrd did not help either!