Microsoft have released following updates, and if your wondering ‘When would I need to install these?’– Its simple answer the following question: Do you have Hosts in a Cluster? Install both if you answered Yes. Install KB981314 whether you have a Cluster or not as it addresses intermittent connectivity issues among other things. Install on all Windows 2008 R2 systems managed by SCVMM – The "Win32_Service" WMI class leaks memory in Windows Server 2008 R2 and in Windows 7. Install KB974930 on all Failover Cluster Hosts managed by SCVMM – An application or service that queries information about a failover cluster by using the WMI provider may experience low performance or a time-out exception.