Unknown storage : Physical : ERROR

Hi all

I get this message while trying to get RAM info from W2k servers trough SNMP

OS: Windows 2000 server with SP4
command: /usr/lib/nagios/plugins/check_snmp_storage.pl -H ip_address -C SNMP_Community -m Physical -w 80 -c 90
Unknown storage : Physical : ERROR

I’ve been searching, and it seems than Win2k is the problem, because W2k MIB doesnt support RAM (physical), only Virtual (SWAP).

If anyone know how to solve this, pls