From what I understand, some of the files may be under be in /Library/Caches, and some may be in /Library/Preferences. Also, in my case they were all in the user library (/username/Library) rather than in the System library. A related issue and instructions (a bit outdated) are posted on the VMWare fusion site:
http://www.vmware.com/support/fusion2/doc/releasenotes_fusion_207.html
Anyway, I was having the same problem, and I think it had to do with switching my system from Spanish to English. After deleting the files as described by macjack, everything is working so far, although please bear in mind that I'm not an expert.