You might want to check this site out for the drivers. Its the Toshiba site in Australia. This site has one of the most drivers for their notebook models. I have found the 1550CDS, the drivers for these should be similar to the 1555CDS. Have used this site a lot for getting the drivers for my office notebooks that are mostly old toshiba models.

http://203.56.127.6/site/open/support/bvfiles.html