You'll have to check a few things in the bios.
First of all, you need to enter it, which is done by pressing a required button during the computer starts up (the very first screen). Usually, instructions on which key to press are given on that very same screen (it will probably be DEL).
Once you have entered it, proceed to the Standart CMOS features:
find field Drive A and make sure it is set to "1.44...." (instructions on how to set settings can usually be seen on the right hand side of the screen). If it wasn't set accordingly, try booting Windows after the change in bios.
If your BIOS settings were set properly (Drive A set to "1.44...), then in the bios go to Advanced bios features and set the first boot device to Floppy (instructions on the right). Insert any kind of floppy (startup floppy would be the best), and reboot. If you get no action from the floppy device, open the computer case and check if the floppy cable is connected firmly. If it is, your friend needs to do some shopping...