VISTA admin password forotten

Hello,
I have been reading hese forums, but I have some more questions. I did the safe mode thing (as a limited user) and i either ave me an error or did nothin. I resart thinkin it may have worked but I still can't et in. I want to do a recovery disc, but a the moment my cd/dvd drive is out. I have a usb memory stick, how can I make the pw recovery boot from that, if at all possible?