hello... there are many versions of Windows 7... you can download a ISO file of that version... you will need to download the Windows ISO USB/DVD utility... and make a bootable USB or DVD to install Windows 7... type in your product key... activate in 30 days.
find your version of windows 7. if its an oem key etc since an oem key will not work on a retail version.almost all laptops are oem keys as well as pre built systems. find the correct one and torrent the correct iso file and insert your product key
Well you can download 7 from "digital river." But you have to PAY for it.
Then use a DVD program to create an ISO disk.
I use NERO to make ISO disk. It actually worked pretty good.
But it may be easier to get a real DVD from Microsoft...
"microsoft software for students" will sell you 7 pro for about $40. And, this includes the backup disk.
But you MUST have a student e mail from your college, etc...