can't turn off "remember password" for shared ntwk resrcs

I would like to be prompted for a password every time I
access a shared documents folder over the network on a
particular computer in my workgroup (because other people
use the computer I'm connecting to the shared folder
from... people who I don't want to have unhindered access
to the shared folder). But I can't figure out how to
keep windows from remembering the password. When I first
connect to the folder, I"m asked for a password. But
each subsequent time, windows just automatically connects
to the folder without asking for a password, even though
I never checked the "remember password" box. Can anyone
help me solve this problem? It seems to be by design,
because every windows box I've worked with does this.

I can I securely access a shared folder from a 'public'
computer?

Any help would be greatly appreciated,

Jay