Troubleshooting Windows 7 Failure to Boot

You must get the Installation DVD (in tutorial) or Repair CD to boot to do the repairs. How to Boot your Computer from a Bootable CD or DVD . If it won't boot from BIOS Boot order, use the one-time Boot menu key given on first screen. If that fails, burn another DVD or Repair CD, or write to flash stick.

You also need to boot Windows Defender or similar before to disinfect or Win7 may not repair.

Ninety percent of the time a disk's failure to boot is due to User error not booting it correctly.