press Fn + F5 buttons together at the same time. This will enable and disable touchpad.
Just one question: did you read the user manual preinstalled on Toshiba notebook?
Would strongly recommend doing this
high...if u use MicrosoftMouse.. just instal lastest IntelPoint ..if no.. just g oto ur Mouse Setings and u will find there ur Touch Pad Seting..OR...go to ur Device Mennager In ControlPanel/System/DeviceMennager/ and find ur touch pad device and in Propieties just Disable it..