First question: did you try going to the Synaptics website for the driver?
Second question: did you try going to the Toshiba notebook website and getting the drive there for your model of notebook?
Third question: did you try a search engine such a Ixquick, BING, or Google to find the driver?
Fourth question: did you try the Windows Update feature?
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You might try here at the Synaptics website:
http://www.synaptics.com/support/drivers