@ murphyker - Run nero setup again. select remove/unistall & it should unistall the installed nero components.
If you must have to install nero 7 then install it in compatibility mode. That is extract nero files from the archive using winrar & go to the dir where you have extracted those files. No find the setup.exe file - right click on it - select properties & in compatibility tab
select run this program in comaptibility mode & select XP sp2.
or else use nero 8. nero 9 is slow & consumes a lot of ram as comapared to nero 8.
Also. Update your vista with SP1 as it solves many issues in vista.