start smart is the opening window where you can choose from the programs in the nero suite.
once again, we need to know which specific nero program you're trying to use.
also what format are the files you're trying to burn? if they're dvd files, i'd just use Recode.
it sounds to me like you might be using VisionExpress. if that's the case then I'm not sure how to remove menus. I mainly use Vision Express for burning multiple titles to a dvd and therefore like having the menus to choose from.
do you want to keep the menu on the dvd? there are advantages to this since some movies are structured so you cannot change audio tracks or subtitle tracks with the remote. they require these changes to be made in the menu.
if you want to eliminate menus altogether and already have the dvd ripped as dvd files (bup, ifo, and vob files inside a VIDEO_TS folder) then I recommend recode or dvd shrink in "Main movie only" mode.