@nvidia8800
It is certainly possible as bydefualt Vista Share doesnt allow access apart from Admins to such folder...
either copy when you are running Vista or, chane the permission settings
Right Click on the Directory or the Drive click properties and go to Security TAB
Now please Click
Add
At the next window please click Advance, and then Find now... at this point all possible users would be in front of u, select
Everyone and Click OK
Now make sure you have allowed all permissions to user
everyone
it should allow to access the directory and its subdirectory from all other OS of the system