my personal favorite, and it's free, is to go to a command prompt and rename the folder... but hangon... there's a catch...
let's say you named the folder "stuff" in windows...
now click start>run and type command in the Run window, and click ok... you now have a DOS (command) prompt... change over to the directory you have the "stuff" folder (directory) in (i.e. "cd \mine" where "mine" is the folder on the root of the directory tree that contains the folder called "stuff"

...
now... to rename the folder in a way that one who tries from windows can't see it, type "rename stuff [ALT+2+5+5]stuff"... in the brackets, you would combine all this to create _ ... now if you type dir, you will see:
.
..
stuff
notice, there is a space at the beginning of stuff... this is a null character that you created in the command prompt... now, if you try to double-click on the folder from windows, you would get the following error:
"The folder 'C:\mine\_stuff' does not exist"
kinda screwy, ain't it? well... win9x does not recognize the DOS created null character, and cannot translate the folder name...
to be able to access the folder again, you need to go to a command prompt again, change to the directory containing the "_stuff" folder... type "rename [ALT+2+5+5]stuff stuff" it will then rename the folder back to just "stuff" and then you can access it from windows...
just a thought... but, it's free...