Make your folders invisible with out Hiding
For Hiding folders read this:
Hide files and folders
How to hide important Messages or Documents
1)Right Click on the desktop.Make a new folder
2)Now rename the folder with a space
(U have to hold ALT key and type 0160).
3)Now u have a folder with out a name.
4)Right click on the folder>properties>customize. Click on change icon.
5)Scroll a bit, u should find some empty spaces, Click on any one of them.
click ok That's it,
Now u can store ur personal data without any 3rd party tools