If you fill out the system specs it helps us help you. What drive and what motherboard are you using? It may be that you need to install your sata controller drivers prior to install.
Your problem could be the USB optical drive (although this sounds like an issue I had with SATA drivers) if you have a USB Drive of 4GB or more then try you could try the install from there use THIS GUIDE
If you need the ISO go Official ISO Downloads