Everything is fine on the log, Iso is correctly mount to the VM.
Connecting ide1:0 to '/vmfs/volumes/51e31a01-f16017de-38a1-f4ce46b6bd72/BIN/Win2003R2-64 ISO/Win2003R2-64.ISO'. img=1 raw=0 remote=0
I suspect a non-bootable ISO. Can you test with a live CD for exemple to exclude somes issue with VMs?
Regards,
Julien.