1. You can't use that license on 2 PC's at once.
2. Download the relevant ISO from here:
http
/www.w7forums.com/threads/official-windows-7-sp1-iso-image-downloads.12325/
Create a bootable USB via this:
http
/www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool