http://www.toshiba.co.th/beta/th/support/download_Sat_L510.html
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WLAN RTL8187B Driver installation
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1. Download latest drivers (RTL8187B_driver_only) at Link: http://www.realtek.com.tw/downloads/downloadsView....
2. Extract it
3. Open with an editor net8187b.inf ( WinXP folder )
4. Change at ControlFlags to 8197
ControlFlags
ExcludeFromSelect = USB\VID_0BDA&PID_8197&REV_0200
and add following line to the end of IDs
;;****************************************************************************
;; IDs for 98SE/ME/2K/XP
;;****************************************************************************
Realtek
%RTL8187B.DeviceDesc% = RTL8187B.ndi, USB\VID_0BDA&PID_8187&REV_0200
%RTL8187B.DeviceDesc% = RTL8187B.ndi, USB\VID_0BDA&PID_8189&REV_0200
%RTL8187B.DeviceDesc% = RTL8187B.ndi, USB\VID_0BDA&PID_8197&REV_0200
5. Save it and try again.