start with a Win98se OEM floppy disc from click here
Put a floppy disc in comp, and double click the above file to create a Win98se floppy start disc.
Start with the Disc in comp, if it does not reccognise the floppy, you will have to go into BIOS by pressing Del key or some other to get into BIOS. Set the Computer to Boot from first device Floppy disc.
After starting with floppy, let it load to A:\> then type FDISK /MBR C: press enter