Sony PCG-NVR23 - Manual (Page 139)

Troubleshooting the Mouse and Touchpad
My mouse does not work.
 If you connected a mouse to your computer, make sure the mouse is plugged into the mouse connector. See
Connecting a USB Device in the online VAIO ® Computer User Guide for more information.
 If you are using an optional Sony USB mouse, make sure the mouse is plugged into the USB port.
 If you are still experiencing problems, use your supplied Application Recovery CD to reinstall the mouse drivers. See
Using the Application Recovery CD(s) for more information.
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