Repair Windows 7 After Windows 10 Upgrade
Under the backup tab, select the file. Do a check disk on the win 7 drive. To find that information, press windows key + x, click system, then review your system details. In the setup window, select install now.
When the file is downloaded (bottom left) click on it to run the setup it will ask to allow to make changes to. If your system came preinstalled with windows 10 home or pro, you could. If that doesn't resolve the issue, see fix. Then, install the windows update or service pack again.