try searching first thru toshiba support websitehttp://www.csd.toshiba.com/cgi-bin/t...pd/cs_home.jsp
Pick support link then supply your model type and model number
Perhaps there will be a newer driver for your machine ... otherwise you can check out the product specs for your machine and if you can figure out who vendor is of the wifi product check the vendor website.
Have you tried windows update already to see if microsoft website has a WHQL (or whatever that is) microsoft certified driver for your machine?
Settings -> Control Panel -> System (then find device manager) is also another way to get some hardware details then try vendor website.
Hope this helps!