Did you know files never actually get deleted? That’s why they can be recovered; by you or someone else. If this makes you feel uncomfortable, learn how to securely delete files.
You probably want to perform a clean installation. With Windows 8, this typically doesn’t involve formatting anymore. Let’s find out what you can do instead.
If your Mac’s hard drive is small and your Time Machine hard drive is big, it might be worth using the drive for both backup and storage purposes.