two articles:
http://support.microsoft.com/kb/927069
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009187

apply the changes in the microsoft article first
then run the commands mentioned in the vmware article when the VM becomes unresponsive:
vm-support -x
/usr/lib/vmware/bin/vmdumper <world id> nmi
(the above commands are for pre vsphere 5.x hosts)

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