I had the same crash issues installing 6 over 5 - crash before I got the EULA dialog almost immediately upon load. I did http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1017838 ,restarted, then fresh installed 6 and it solved my issue. You will have to repopulate the Virtual Machine Library. Don't do Import on items that are not a Bootcamp partition. Just File --> Open.