Standard users file/folder access problem

Hi,

I just did a fresh install of Windows Vista Home Premium. On this PC we have
1 Admin account and some other users.
As far as I had read, just like in XP, standard users should not be able to
access files and folders of other users on the PC. This was also true if the
user browses the folders or if search is done through the search window at
the bottom of the start menu.
However, if search was done for the file/folder name or content via Start
menu - Search (in the right column), the standard user got full access to
these files/folders belonging to another user. I just talked to MS Support in
Sweden, and they were immediately able to reproduce this problem.

Please let me know if you have encountered this problem and if you found any
solution.

Best regards,
Ralf