Making a bootable CD would probably be the easiest way, IF your bios is new enough to give you the option of booting from the CD-rom, and if you've got access to another computer with a burner and a floppy drive. With easy cd creator 3.5 (probably similar for any other burning program) you just copy the contents of a boot disk to the hard drive, and burn it to CD... just make sure to select ISO 9660 (or something like that) and check the box for "make bootable". Then reboot with the CD in the drive, and it should work.
Of course, if you don't have access to another computer, it doesn't help you at all right now.