You can actually make a new copy by burning a new disk or make a bootable USB with Windows 7 on it. Also, you need to ensure that you burned it at the slowest speed. When you say it is the original Windows 7 disk, do you mean the actual OEM that comes from Microsoft or you are using a Windows 7 disk that you just copied from the original source? If you just copy its ISO file and then burned it, ensure that the MD5 and the CRC checksums matches from the source.
The most possible reason is that your Windows 7 installation disk has been damaged or corrupted. Error Installing Windows 7: No Device Drivers Found
