It's ok, just delete the file on your prime client C:\cygwin\home\<your username>\.ssh\known_hosts
From cygwin, run ssh root@vm07.nubav.thinkon.net "vmware -v" and answer 'yes' at the prompt. Do the same for each of your hosts using the fully qualified domain name. You should see the host's version of ESX as output. If you do, re-run VMmark.
Thanks,
Rebecca