If you wanted to use both VM Ware Fusion and boot into it natively, you can indeed do that. To do this you need to do a boot camp install of Vista (meaning it will actually take space on your hard drive in a separate partition on your disk). Follow through the steps to install Vista via boot camp (using boot camp assistant [very simple]). Once you have done that, open VM Ware and it will let you run your boot camp install side by side with OS X when you choose to. I do believe you still need to install the VM Ware tools, but this shouldn't mess with it when you boot the entire computer into Vista.