..reformating is never the answer. as you never truly know what happened.
Laptops have drivers
SOLD to them they are not actually found on the vid cards manufacture site.
they are liscensed out to the manufacturer of the laptop. So the trick to get drivers installed goes more like this.
In device manager you will see your ati graphics.
Choose update, choose browse for drivers NOT auto search.
Have disk then you will see Generic option listed with your ati drivers.
Choose the generic adapter.
Comp will reboot be in low res. Then check to be sure VGA adapeter is your current display adapter, ( device manager)
THEN From the Manufacturere site ( if Toshiba hten that site) and download your laptops version ( model number on the buttom ) install that right from teh downloaded package and it shall work.