GoBack will not let computer boot up and I cannot disable GoBack.

This is a nightmare. GoBack tells me that it has to reboot because there has been damage to the hard drive or something. It suggests that I scandisk when I come back. However, it will not let the computer boot to the point where I can run the scandisk, either in normal or safe mode. And when I tried to disable it, it rebooted again. And told me that it had rebooted in the middle of disabling, and did I really want to disable GoBack. If I hit "Yes," it reboots yet again. I cannot boot up using a log because it will just reboot to normal if I choose that option. I mean, this is like it is haunted. What can I do? I need to scan the disk, obviously, but GoBack will not let me in.