The CPU monitor of MonitorWare Agent uses the Windows WMI System to query the CPU and memory related information from system. On Windows 2000, there is a known Windows Management Instrumentation (WMI) bug that reports continuously 98% of CPU usage. In this case you will need to install a Microsoft Hotfix to solve the issue.
You can get more details about this WMI bug and hotfix from the following link:
WMI Return Value