KBArticle

In System Center Operations Manager 2007, agents may consume 100 percent of CPU resources for the Monitoringhost.exe process. This problem occurs on x64-based computers.

A new Knowledge Base article has been published to address this and there’s a hotfix available for download. 

For details see the link below:

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KB974051 - Operations Manager 2007-based agents consume 100 percent of CPU resources for the Monitoringhost.exe process

J.C. Hornbeck | Manageability Knowledge Engineer