Cannot manage WinNT

Please help me managing WinNT OS.

The OpManager was installed on our Win2k3 server. I can easily add devices but I cannot manage all devices with WinNT OS. Even the SNMP and Trap were already configured and started.

But there is no problem managing WinXP, Win2k, and Win2k3 servers. Except to my one Win2k3 server (an antivirus server using Apache2 services) that looses network connectivity (Network hardware failure) after a few hours and need to stop SNMP (with 100% cpu utilization), Disable Network connection and restart the server. (Need help to this topic too.)

Go back to WinNT, every time I try to test the device a "no response" has been displayed. Is there anything do I need to configure on WinNT SNMP service? or in MIB configuration.

Thanks and regards,

deo