It says "No bootable device" "Insert boot disc and press any key".
This sometimes shows up if the floppy drive is set as the first boot device in Bios, and the disk in the floppy drive is not bootable. What model number is this Sony?
Have you attempted to boot to Safe Mode? To enter the Safe Mode menu, continually tap the F8 key just after powering on the computer.
If you're abe to boot to Safe Mode, try choosing the option "Last known good configuration" as the boot option.
If this doesn't work, try Safe Mode (with or without Networking)
We need to know if you can even boot before continuing. If you can't boot then you may need to do a Windows repair. Do you have the XP Disc?