A memory leak occurs in performance counters that are used to monitor Windows Server 2008-based computers
When you use Microsoft System Center Operations Manager 2007 to monitor system performance on Windows Server 2008-based computers, a memory leak occurs. Specifically, this memory leak occurs in the performance counters that are used by System Center Operations Manager 2007.
Note: Any applications that use performance counters in Windows Server 2008 may also experience this problem.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB951116.