Can't clear C and D drives whilst reinstalling windows

[Hawksworth]

Hi

I just reinstalled windows to try and clear my hard drives to as new, however when I look at my C and D drives all the files are still there even though windows has gone through the whole installation process.

I have everything backed up on an external drive so how can I clear C and D drives to as new please?

 

[Hawksworth]

Alright, got it, cheers guys.