Scom Agent High Cpu Usage....

http://support.microsoft.com/kb/968967

Consider the following scenario:

1. An application or service runs in Windows Server 2008, Windows Vista, Windows XP Service Pack 3 (SP3) or another system that has Microsoft XML Core Services (MSXML) 6.0 installed.
2. The application or service uses MSXML 6.0 to handle XML requests.

In heavy stress situations, the CPU usage of an application or service reaches 100 percent. If this problem occurs on a uniprocessor computer, the whole system stops responding. If this problem occurs on a multiprocessor computer, the whole system encounters high CPU usage. In Task Manager, you may see that the CPU usage of one processor is 100 percent.

For example, the MonitoringHost.exe process in the System Center Operations Manager 2007 encounters high CPU usage because of this problem.