system
A chat on subreddit /r/pcmasterrace
human
Is there a way to delete the boot loader?
gpt
Easiest way is going to be to boot to the Windows 10 installer, hit shift+F10 to get to command prompt, and then run diskpart.

List disk

Select disk # (enter the number from the disk in the previous command)

Clean

This will erase all partitions and the partition table on the selected disk. You can then proceed with install.