can't customize start menu icons

hi, I used to create new folders on the start menu to organize it better.
And, in some cases, customize the icon to be shown in known program folders
(like microsoft office, adobe, etc.)
In windows vista it allows me to do that but when I finished, there's no
change (I usually select the office icon to be shown instead of a common
folder icon in the start menu)...
Any idea on how can I do this again in vista?

Thanks