If your hard drive has operating system installed on it:
Once you get the new parts,
Create a bootable USB by downloading Windows from
HERE; before installing the new parts or use a different computer.
Simply install windows, delete all partitions and create new ones during the windows installation process. This will automatically delete all data on the hard drive.
If the operating system is not installed on the hard drive,
Go to "This PC". Right-click on the drive and click format. NTFS format is recommended.
NOTE: Make sure to link your microsoft account with your windows so you won't have to buy windows again. Microsoft allows you to transfer windows from one computer to the next. You might have to deactivate windows on the old computer first.