I'm not a windows user per se, but as I recall on windows, in Control Panels, there is an admin section for setting up areas on the computer for various permissions, such as Shared by all or shared by specific admins, your choice who has access. My guess is this is the best way to ensure full permissions for both of you.

I am aware VISTA can be a little problematic with permissions.

I did a forum search, these are some relevant results i found on this topic:

(1) http://www.gnutellaforums.com/open-d...tml#post127932

(2) http://www.gnutellaforums.com/genera...tml#post163511 (see posts from here down, especially via Grandpa who is a Vista user ... not sure if he was already using Vista at that point.)

(3) How to take ownership of a file or a folder in Windows XP

(4) http://www.gnutellaforums.com/open-d...tml#post166559

(5) http://www.gnutellaforums.com/gettin...tml#post243491

Below is Windows 2000 image (old I know lol, but roughly similar to approach you will need, perhaps adjusted for specific users only though. I do recall seeing that option.):