Hey there, Jacy.
I assume you're talking about Windows 10. From what I understand you want to reformat the drive and make a fresh install of that Windows version? If "yes", you can follow this tutorial: http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html. However, if this is not the case, please correct me if I'm wrong.
Don't forget to backup any important data which you might have on that drive, before you reformat it!
Hope that helps.
Boogieman_WD