SO I was getting a VMWare Fusion Internal Error after upgrading to VMWare version 7 from version 6. I spent 2 1/2 hours troubleshooting - doing everything from file permissions on log files, to uninstalling manually and reinstalling, uninstalling and reinstalling VMWare Fusion 6, and many, many other things.
Finally it dawned on me to run the Disk Permissions under Disk Utility on the OS X drive.
Problem solved.
I hope this helps someone. I didn't find any other post anywhere on the planet with this information.
Wishing you all much success!
Crash Jones