Hi,
I know this is a bit late but this could come handy to those who, like
me, found this thread though Google ...
I was looking to do the exact opposite : I wanted to disable this bad
beep on DOS, that was hurting my ears when I was importing massive SQL
files (with massive errors in them ...). I'm on Vista too, but had this
beep problem on XP also.

The solution was :
net stop beep

Maybe in your case the beeper is disabled by default (I would not know
why) , in which case you should do :
net start beep

These lines should be typed every time you reboot your PC.
Another, definitive, solution :
sc config beep start= boot
and the opposite :
sc config beep start= disabled

I found them in this page:
'Windows Tip: Silence Windows' Command Line Error Beep'
(http://lifehacker.com/348271/silence...ine-error-beep)


--
Arkhee