I need windows 7 or 8 installed alongside Ubuntu 16.04.
Since I just got the computer, I don't really have any important data on it, so if I lose anything, it doesn't really matter.
Can someone give me a tutorial for dual booting Windows on an Ubuntu 16.04 machine?
As per your own statement, there is nothing important on the machine which means you really don't need to keep Ubuntu. Install Windows first, then install Ubuntu. Here is a link to start off: http://askubuntu.com/questions/107538/how-can-i-dual-boot-windows-and-ubuntu – jawtheshark Sep 13 '16 at 07:47