HT2490 I can't open folder or files by just double clicking

I can't open a personal folder on my desktop without using my keyboard or right clicking then open. Is there a way I can change settings to just double click top open a folder or file?

How to Adjust Mouse Settings in Mac OS X Lion
By Bob LeVitus
7 of 9 in Series: The Essentials of Adjusting Settings in Mac OS X Lion
Some Mac OS X Lion users like to customize the way their mouse works. The Mouse System Preferences pane in OS X Lion is where you set your mouse speed and double-click delays.
If you have a notebook Mac, you may see a Mouse icon in the System Preferences application, but unless you have a mouse connected via USB or Bluetooth, it will just sit there searching for a mouse that's not there.
The first item in this pane is a check box that’s new in Mac OS X Lion: Move Content in the Direction of Finger Movement When Scrolling or Navigating. If scrolling or navigating in windows feels backward to you, try un-checking this box.
Next are the features you’ll find in the Mouse System Preferences pane (if you have a mouse connected):
Move the Tracking Speed slider to change the relationship between hand movement of the mouse and cursor movement on-screen.
The Double-Click Speed setting determines how close together two clicks must be for the Mac to interpret them as a double click and not as two separate clicks.
If your mouse has a scroll ball or scroll wheel, you also see a Scrolling Speed slider, which lets you adjust how fast the contents of a window scroll when you use the scroll wheel or ball.
If your mouse has more than one button, you see a pair of Primary Mouse Button radio buttons. These let you choose which button you use to make your primary (regular) click. Conversely, the other mouse button (the one you didn’t choose) becomes your secondary (Control or right) click. This is a setting many lefties like to change. Set the primary button as the right button, and you can click with the index finger of your left hand.
Original article located at...
http://www.dummies.com/how-to/content/the-essentials-of-adjusting-settings-in-ma c-os-x-l.html

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