Deleted all Operating Systems, how do I install Windows 7? (USB)

So I had Ubuntu, when I installed it I accidently overwrote windows.

I tried to get it back now but I think I messed up badly. I formatted /sda1 as NTFS and deleted Ubuntu.

I have live Ubuntu on a USB & Windows 7 on another one. How do I install windows 7 back? At the moment I'm using a live ubuntu USB as I have nothing else to use. When I go on gparted, these are the main things that show.

Partition:
/dev/sda1
/dev/sda2
/dev/sda5
unallocated

File System:
ntfs
extended
linux-swap
unallocated

Size:
462 GIB
3.75 GIB
3.75 GIB
1.02 MiB

/dev/sda1 has the flag: Boot

That's all that's on there. I hope someone can help me! :)

Do you want to clean install Windows 7 with Windows 7 as the only OS? If that is what you want to do, then you will boot the computer from the Windows 7 USB flash drive. When you get to the choice to upgrade to Windows 7 or Custom Install, select the custom install option. That will give you a list of all partitions on all hard drives. On the hard drive that you want Windows 7 on, delete every existing partition on that hard drive until you have 1 unallocated space (that will erase that hard drive). Then just pick the unallocated space and next to install Windows 7 to the hard drive and let Windows 7 partition it the way that it wants.

Yes, that's what I want to do.

ive tried that, but it never boots Windows. It just skips to a black screen and says
checkign media [fail]

i set bios options to boot from USB as well, + tried uefi on and off