This machine was never shipped from Toshiba with Windows XP installed, only Vista... hence they have no drivers posted for this model and Windows XP sound. It has a Realtek sound chipset. Which one? I don't know but you might give this one a try:
http://members.driverguide.com/drive...riverid=890370
It's for the Toshiba Equim M40X machine but could be the same device as your machine has.