- You haven't given the complete model number.
When you have it look it up at this link to see if Toshiba supports and supplies XP drivers for your model number...
https://support.dynabook.com/support/modelHome?freeText=2190171
- Check to see if that model number also supports Booting from USB.
If it does you have to change the Boot Order to USB in the BIOS/Boot Order.