[WinPartners] Password protect a folder

[Read Schusky]

My boss would like to be able to password protect a folder in Windows XP. 
Does anyone have a suggested program for that, or seen a review of such 
programs? Ideally the folder and it's contained files would still show up 
in Windows Explorer or when she goes to open a file (i.e., I don't want 
anything "hidden"), but a dialog asking for a password would come up when 
someone tries to open anything in that folder, and she'd be able to save or 
move/copy anything to that folder and have it immediately protected (i.e., 
compressing the folder & passwording it isn't a good solution). This 
doesn't need to be heavy duty (e.g., encrypting the files isn't necessary), 
and once it's set up it needs to be pretty transparent except for requiring 
the password. Setting up multiple users in Windows itself is not the way 
I'd like to go.