first create a newfolder(on desktop)
Then name the folder by pressing alt key(dnt release it) n type 0160(from the numeric keypad) frm the keyboard.
Then after naming the folder u will find ur folder without any name, only the folder is visible.
Now right click the folder, then click on properties, then under customise tab or page click change icon. Then select the blank space and click ok.
Then click apply button to apply the settings n click ok.
Now ur invisible folder is created.
u can open it by pressing the left mouse button n then move ur mouse on the whole screen. u will see a blue, rectangular small box. This is ur invisible folder. click on it to open ur invisible folder.