Seven would use her nanoprobes to infiltrate the computer system, download all the future information that could allow them to find a way home, all whilst Voyager
engages Nero's and (despite being a fraction of the size and severely out-gunned) manages to hold their own. Once Seven is done, she downloads a computer virus that causes the ship to destroy itself, leaving Voyager
with all the advanced information for them to study and maybe shave a few years off their journey.
Then Janeway presses the reset button and it is never mentioned again.