This video provides a solution for users whose computers have become unbootable after attempting to convert their partition scheme from MBR to GPT to enable Secure Boot, particularly on systems without UEFI BIOS. The tutorial guides viewers through creating a bootable USB drive with Hiren's Boot CD, backing up data, and then using partition tools to convert the drive back to MBR. It also covers optional steps for cleaning up partitions and restoring the Windows recovery partition.