Ok for when Gaz gets back :-

You need to re-start your computer, and hold in the DELETE key until the BIOS screen appears. You will then need to go into one of the menu's in there and look for something about the Boot Sequence. Normally this will be set at something like A, C, CD-ROM or maybe written differently, for example ( Floppy, IDE-0, CD-ROM).

You need to make sure the firsty boot device is your Floppy drive, and not your hard drive (IDE-0). Then exit the BIOS, saving the changes you have made (if any). Then when the computer starts up it will look in the Floppy Drive for something to Boot up from. It will find the Disc which you're getting from Adam and will ask if you want to start windows with CD-ROM support. Just say go with that and it will spend 30secs or so loading some files and you will end up in DOS with an A: prompt. At this prompt you need to type format C: (assuming your hard drive is labelled C). It will ask if you are sure you want to format, so type Y and it'll do its thing. In about 10-30mins it will finish, and will ask you to type a name for your drive, so type Hard Drive or something like that.

Thats the actual format done. The nex steps depend on which OS you are going to use (ME by the sounds of it) and so IF it boots from the CD as someone above says it does, you need to go back into the BIOS, and change the 1st boot device to your CD-ROM drive, then exit the BIOS, and when the computer re-starts it will find the ME CD to boot from. Then follow all the on-screen instructions and you should end up with ME back on your machine.

You'll need all your motherboard drivers for sound, graphics and modem etc (i presume, never used ME myself).