I have this exact same issue 'Could not open /dev/vmmon " etc.
I do not have, or at least am not aware that I have the SNS Network Solutions iSCSI initiator on my system. Even if I did I wouldn't know how to uninstall it. 
My situation is that I have this OS X 10.8.4 system, onto which I migrated an old 10.7.4 system using Migration Assistant. I didn't power down my Windows 7 VM before doing the migration, should have read the manual I suppose. Whatever the MA did to my old system it now won't boot. I just powered it down following the migration not thinking anything of it and now it won't boot. My guess is that the Apple Migration Assistant did something to prevent the old apps and system from booting. Googling the problem comes up with nothing. The long and the short of it is that I can't get back to my old system to shut down the VM.
I followed the advice of uninstalling VM 5.x and reinstalling and repairing permissions, no dice. I followed the suggestions to fake the VM into a shutdown state, no dice.
I have attached my 'ls -l /dev' in the file called devlist.txt. I have attached my Support Information from VM Fusion.
Help please is all I can ask.