Can't access shared folders....

> I like to have my desktop PC at home set to show the welcome screen when the
> screen saver comes on. To log back into Windows, you have to enter your
> password.
>
> I have a simple wireless network that includes a desktop PC upstairs,
> running Vista, and a laptop that is usually downstairs running XP. When I
> had XP on both machines, I could access shared folders from the laptop that
> were located on the desktop as long as somebody was logged into Windows on
> the desktop machine. It did not matter if it was locked by virtue of the
> screen saver activation.
>
> With Vista, I cannot access shared folders when the desktop is locked
> without entering a username and password. This is annoying and I don't know
> where to go to fix this problem. The intent of locking the desktop once the
> screen saver kicks in is to prevent someone from else from getting to my
> personal files, not prohibit access to shared folders.
>
> I have set the file sharing options as follows:
> Network discovery: On
> File Sharing: On
> Public folder sharing: On (read only)
> Printer sharing: On
> Password protected sharing: Off
> Media sharing: Off
>
> Could somebody tell me if there is a way to get it back to how it was with
> XP? If I have to leave myself logged into the desktop without enabling the
> "On resume display logon screen" option (thereby allowing anyone to access
> all of my personal files) in order to allow access to freely shared folders,
> then I'll just go back to XP. But hopefully I'm just not finding the setting
> to turn that feature off.
>
> Thank you in advance.
>