how to really unshare my document folder

My XP has 2 administrators. Each administrator cannot open and see each
other's files inside the "My Document" folder. In Vista, it is default to
share "My Document" folder to everyone. Superficially it says it is already
not shared, but in fact everyone can open and see the files.

How can I really really unshare my documents?

I also hate to share my outlook calendar to other users on my computer. It
is now shared in Vista!

Is there a way to fix this?

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http://windowshelp.microsoft.com/com...unts_passwords