If u want to hide any folder from your friend then follow the steps...
1) Right click on that folder, then click on properties,then customize, then change icon.
2)Select a blank icon for your folder.
Now ur folder is hidden but its name is still visible.
So to hide the name also..follow the steps.
3)'ON' your num lock from keyboard.
4)Select your folder and press f2 for Rename.
5)Rename the folder by pressing alt and type 0160 from num pad.
then your name will also hide.
Note-Press 0160 from num pad only,while renaming the folder.