This is apparently a problem with the video driver in the VMware tools for 2008 R2.
Try uninstalling the tools and reinstall without selecting the SVGA driver.
See http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=101170.... (applies to 2008 R2 as well).
http://communities.vmware.com/message/1373347#1373347
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