Get a copy of the ISO of W7 - does not have to be of same version - can be any version. If the CD is there, use that instead. However, the correct build ie x86 or x64 should be there. Install the Windows 7 USB tool form the Microsoft store on any PC with the DVD ROM inserted or the ISO. Depending on your using the CD drive or the ISO, select that option. Make a USB bootable drive. Delete the ei.cfg file if the version is wrong. It will ask you to select which option you want to install with.