Be on the lookout for a Windows 7 installer. They are all alike with some versions hidden due to the presence of an ei.cfg file in Sources folder, which you can remove then recompile the ISO to burn to DVD:
Bootable ISO - Create from Installation Files
Until your find or borrow an installer to copy, be sure to create a System Repair CD as you will need it to reimage the HD using the Windows 7 backup image, or for other repairs if Windows 7 won't start.