RAID set not seen by windows

The threads I've seen here come close, but don't exactly touch on my problem.

I have a w2k machine with sp4, and put a pair of SATA drives on to run as a RAID pair (not, so far, as the system disk). To test these, I set them both up as non-RAID drives, and Disk Management sees them just fine. I can create volumes, format, and copy files to and from them.

BUT when I set them as a RAID pair (striped), in BIOS and the RAID tool, Disk Management cannot see them, though w2k finds them and installs the drivers. Rescanning does nothing. The RAID tool (imbedded) says they are healthy. I DL and installed the latest drivers for the mobo (asus 8an sli deluxe) for SATA drives, and they seem to install fine, but get a ! indicator, and "not working properly".
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