Problem: XP can't be installed, nor Vista
Toshiba Satellite L40 web site claims that various versions of BIOS work for either Vista or XP.
BIOS version 1.60 upgrade for Satellite L40 (For PSL48*-*****,PSL4C*-*****).This BIOS is intended for use with a Windows Vista OS.
For XP, F6 SATA drivers should be slipped into XP instalation (N-lite)
Drivers for F6 SATA are hidden under utilities.
Also, depending on Model there are various wireless drivers, the name can be found on the down side of laptop.