This is a very common issue,
Although can be very hard to troubleshoot, where's a nice article that describes step-by-step how to troubleshoot this error.
· 958124 A wmiprvse.exe process may leak memory when a WMI notification query is used heavily on a Windows Server 2008-based or Windows Vista-based computer
· 954563 Memory corruption may occur with the Windows Management Instrumentation (WMI) service on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1
· 955805 Certain applications become very slow on a Windows Server 2008-based or Windows Vista S955805-based computer when a certificate with SIA extension is installed
· 961983 Description of the hotfix rollup package for System Center Virtual Machine Manager 2008: April 14th, 2009
Nice job :)