Make Folders invisible

First create a new folder somewhere on your hard drive
To name it hold down "Alt" and press "0160"(both simultaneously) this will create a nameless folder.(Be aware that ur numlock)

Then right click the unnamed folder and select "Properties". select the tab "coustimize" and click on "change icon"button in foldericons block scroll along and you will get a "change icon for folder" window.Then go to the spot as shown in the figure (circled in red) the spot is nothing otherthan a blankspaces.To find this spot go exactly to the position as shown in figure i.e beside windows symbol(circled in green).click that and click ok. when you have saved the settings the folder will be invisible to hide all your personal files.

Note:-Like wise u can find many such blankspaces as u move through that window(I had only shown one such position in figure).You can click on any one of the blank spaces to get a invisible folder