|What's the hard drive model number?|
You first need to partition the drive so don't start the ME setup yet. You can choose 'start the computer without cd rom support' or whatever gets you to the a:\> prompt. Type fdisk and enter at the prompt, Y to large disk support, then option 4. If it's a used drive there may be partitions on the drive and you should remove them. So hit ESC to get to the previous menu and then option 3 and remove.
Once you've removed them or if there weren't any there to begin with use option 1. It'll ask how much space to use for the partition. For convience choose to use it all.
When it's done, hit ESC and reboot with the bootdisk. Go to the a:\> prompt again and type format c: and enter.
When it's done formatting you can start the installation or reboot and do the installation. You will of course need cdrom support this time.