You can download Nero version 7.5.7 now which should do what you want to do.
You will have to uninstall any previous version that you have installed and
install the update directly. I had UAC disabled but from what I have read I
don't know that it is necessary. The one snag that I had was that it said
that it wanted to install DirectX 9.0C and you had to say yes to get it to
proceed, but it didn't do anything. Once you have it installed then I would
say that you can install your previous data files. It appears like version
7.5.7 is Vista compatible. My hats off to Nero because they could have gone
down the forced upgrade path like some of the other burner applications have.