fedora cant run bootable usb?

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Hi, my name is Day, i have a pc with fedora, it had windows 7 but the previous owner deleted that os. now i want to put windows 7 on it again, i have contacted the microsoft support multiple times and they told me to make a bootable usb of the iso file on a second pc, so i did that and now when i plug the usb in it just opens the usb as a file storage like a normal usb works, and when i restart only the list of the 3 versions of fedora that were already on the pc are shown, no windows, so i told the microsoft support my problem and they told me i had to contact the fedora support and tell them something about a GRUB sequence. can you help me with my problem???