Is the Midi interface he is using compatible with Vista?
I have checked on the Winamp site and there is no mention of compatibility with anything higher then XP.
If he is using a Creative Soundcard (SoundBlaster etc) then there are also problems with some of these.
Unless he has no option, he should not even consider Vista for pro music use, as most of the software and hardware is as yet not compatible with Vista.
The default setting for the start and shutdown of Vista is the front power button.

Bill