I have a P300-19P and have just installed windows 7. Have installed all the relevant Toshiba drivers and everything works fine with the exception of my touchpad, where I have lost all scroll functionality.
I don't seem to be able to find a driver that works nor can I select the mouse as a touchpad under control panel.
As you can appreciate this is rather annoying to lose this, help greatly appreciated.
Explore the settings under Mouse in Control Panel. If your touchpad is a Synaptics one then you can use Uscrybe, a free download from Synaptics. See the features at http://www.uscrybe.com/learn.php