Ok, this should fix your problem. Go to the link below. Download the latest via 4-in-1 driver and the win2k ata100 hotfix. Install them and post your results.
<A HREF="http://www.viahardware.com/download/index.shtm#4in1" target="_new">http://www.viahardware.com/download/index.shtm#4in1</A>
P.S. Has anyone ever had any problems (ie. data loss) when using the dos utility that switches hd's from ata66 to ata100 and back? I switched my wd ata100 to ata66 and am leary about going back now that the drive is full of data.