VMware Fusion 6: cannot start Windows 2000 VM that worked in VMware Fusion 4
Open the virtual machine's configuration file .vmx using a text editor.
Remove the lines which starts with policy.vm.*:

policy.vm.mvmtid = "52 d6 6f f9 f3 36 0f 9f-31 da 9f f5 90 7b ce 76"
policy.vm.managedVMTemplate = "TRUE"
policy.vm.managedVM = "FALSE"

Save the file and close the text editor.
Restart the VM.




If you still encounter the error…


Rename/delete the file with the extension .vmpl
Restart the VM.


For further reading, check out this thread: VM's policies are too old to be run by this version