Hello Syntax,
Thanks for your answer.
I haven't check with an external mouse because it isn't an USB one...
I went to the link, but it is told :" your product is not supported by this site" (???)
Then, on another page (I don't remember the link) I've found "synaptics PS/2 Port Touchpad" , date 14/02/2011 ve. 15.0.8.1 I have telecharged and installed.
Mine was date 10/03/2010 the same version.
So, in the future I'll be able to confirm the problem was the driver... otherwise I'll post again

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I have another question concerning the others driver whose new date is 14/02/2011 for the same version. Is it necessary to update each one ?
I don't understand why it is said "your drivers are update" when I ask to update the drivers from the control panel. Also when I consult "toshiba soft" it is said all is updated...
Regards
Fabienne