1) At the dos prompt, type in format c /s, that will format your hard drive. As for the D drive, I think you will be able to do this from within windows its self. But please wait for someone to comfirm this.
2) Drivers are what come with your hardware, like Sound cards, Modems and G/cards. Make a note of what they are from Control panel/System/Devive manager. If you do not have these drivers, download the from the net. Do you know if their on-board. If they are, then your mother board disk should have the drivers on.
3) Your emails will still be there, when you reinstall, as you haven't downloaded the yet. Still at your ISP. Is that what you mean?