To make an invisible folder in your pc-- windows 7

Firstly, create a new folder.

Right-click on the newly created folder and from the the menu select Rename option.Press num lock & Hold Alt key and press 9 key nine times and then press Enter key. You will see a blank folder name for that folder.

Again right-click on that folder and select Properties.

From the properties window, select Customize tab.

Select Change Icon form the Folder icons part.

Now, select a blank folder icon form the Change Icon for Folder window.

Click on OK button