I don't want elementary OS on my computer anymore and just want Windows on it. How do I remove elementary OS and wipe the hard drive to put Windows back on via a USB?
Try using OS Uninstaller if Windows is installed (dual boot).This will remove elementary OS from you hard drive.A tutorial can be found on the Ubuntu Wiki at https://help.ubuntu.com/community/OS-Uninstaller.
If you only have elementary OS installed , just delete all the partitions when you install Windows.
Both of these will delete all data on your elementary OS partition.
Put in a Windows USB, wipe all partitions and just install Windows.