Sony VAIO VGP-WKB1 Operating Instructions Manual page 52

Symptom
The touchpad does not
work.
GB
20
Cause/Remedy
c The touchpad is disabled.
Enable the touchpad in the touchpad settings.
c The touchpad uses the electric capacitance in your finger
to sense the position. The touchpad may not respond
momentarily, after a static discharge.
If this happens, do not use the touchpad for a few minutes
and it will operate normally.