Windows 7 Patch Tuesday security udpates break VMware software
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1034262
Related: http://blogs.gartner.com/chris-wolf/2011/02/10/windows-7-update-breaks-vmware-view-client-an-important-lesson-in-byod/