Raphael,
do you see a logical drive configured when the Netraid 1M controller comes up at server boot/POST time ?
If so, are you succesfull in loading the 1M Netraid driver from your floppy during the Windows install process ?
The V5.29 driver should work fine and it's downloadable here:
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?locale=en_US〈=English&pnameOID=51917&prodSeriesId=51915&prodTypeId=329290&basePartNum=ns1957&locBasepartNum=ns1957en&os=Microsoft+Windows+2000+Server&tech=Driver++Storage+Controller
With the above 2 points checked i can't think of anything else that could be wrong if the H/W functions correctly.
Hope This Helps
Kris