Recently, I downloaded Ubuntu and accidentally erased Windows 7 from my computer. I bought Windows 7 System Builder OEM disc the other day to restore windows. When I got my Windows disc today I saw that the "optical drive" on my laptop is non existent (it looks like there should be an optical drive or you could possibly install one in the future, but is not there). I inserted the system builder into another computer with an optical disc drive to create an .ISO of it, which I mounted onto a USB after formatting it with Rufus 2.2. I changed my boot order so that BIOS would load the USB first. When I did this I got a security warning, and Windows would not boot.
I did not boot windows on any device yet (I'm aware that you can only do this one time because it ties itself to the motherboard). I chose the previous method of installation because a few google searches recommended to do so.
Does anybody know what I should do in order to boot Windows 7 on my computer?
Acer Aspire V3-572PG 50S 1.
Currently running Ubuntu 14.04 LTS
Previously ran Windows 7.