What can I do if my Windows 10 install fails?

Episode 1211 (2:01:29)

Rob from Vacaville, CA

Rob got an invitation to upgrade to Windows 10, it died right in the middle of the upgrade, and now he can't do anything. He tried to revert to Windows 7 but it won't work. He's heard that his RAID may be the culprit. Leo says if he can boot to his Windows 7 DVD, he should be able to format and reinstall. Leo believes that Rob's RAID array or his hard drive has likely failed. So he may have to rebuild everything.