- Are you using a legally purchased/acquired Windows 7 disk? Is it a Windows install disk from a manufacturer (Like Dell, Toshiba, etc...)? Are you sure it is the operating system reinstall disk and not a diagnostic/utility disk?
- Is the Windows disk scratched, bent or damaged at all?
- When was the last time you used the CD/DVD drive, have you had any problems with it? Did it work correctly the last time you remember using it?
- Are you sure you set the BIOS boot option list with the CD/DVD drive at the top of the list?
- Can you still get into BIOS?
- What kind of computer is it, also include manufacturer/model & any changes you have made to hardware and how old it is. OR is it a computer you built? If you built it please include specifications.
- Are you dual-booting any other operating systems, or are you only running Windows 7 on that computer.
- Were you doing anything to the computer before this happened, and how was it running until this problem happened