Grab Damn Small Linux, 49Mb of it, and burn, then boot the CDrom.
http://pendrivelinux.com/2007/01/02/all-in-one-usb-dslInsert a USB stick into a USB port.
On a blank bit of screen, right click,
Menu apears.
Go down to the Utilities menu, left click,
A sub-menu apears,
select the entry for the boot USB and note there are two ways, USB ZIP device (for the older boxes), and USB-HDD (newer BIOS since ~1999)!