SNMP service is running OK, but get no SNMP relevant data from ser

Win2003SP1. I installed SNMP services, under the "security" tab I included
the community and IP address related to my management server OK. portqry
shows that SNMP data is flowing OK to the server.

However in my management server I see no SNMP graphs coming from such
Win2003Sp1 server. We have other Linux servers that are returning data via
SNMP OK.

What am I missing ? What else should I install on the target Win2003Sp1 to
make this SNMP monitoring work ?