1.) Verify that the touchpad key is enabled ( If it is available ). You can also turn on/off the function by pressing + / .( The keyboard differs depending on models )
2.) Verify that the most recent driver for the touchpad is installed.
• You can download the driver from the following site : http://support.asus.com/download/download.aspx?SLanguage=en-us
• If the driver is installed successfully, then the device should appear under Microsoft Windows Device Manager as “Synaptics PS/2 Port Touchpad”
3.) Please go to Control Panel ==> Mouse ==> Device Settings ==> Settings, and verify that all the features are set properly and are not disabled. ( Such as Tapping, Scrolling and etc.)
4). If you are using an external USB mouse, verify that it is connected properly to the USB port. ( Please notice that Eee PCs don't have PS/2 ports; here is an image of a USB port. )
5.) Verify that the external USB mouse is working properly. ( You can connect the external mouse to another computer to test it. )
6.) Some external USB mice, it may require separate driver installations. Please verify that the driver from the manufacturer is installed. Otherwise, please contact the mouse vendor for further technical support.