[ame="http://www.youtube.com/watch?v=hcrmJm9EfM8"]http://www.youtube.com/watch?v=hcrmJm9EfM8[/ame]
or
Click Start and then Control Panel
In Control Panel, double-click on the Mouse icon
Note: If Control Panel is in Category View, under Control Panel, click Switch to Classic View.
In the Device Settings tab, click on the Settings button.
In the Properties for Synaptics Touchpad window, click on Tapping.
Check or uncheck the checkbox next to Enable Tapping then click OK.
On the Mouse Properties window, click Apply then OK