So I accidentally updated and broke my system like a year ago and haven't tried to fix it since. All I remember is that I was using some sort of modified usb boot disk to load a Vanilla installation. When I updated via software update, it made the boot hang.

Now. I still have access to my mac from inside windows via mac drive.
And it still runs EFIX or Chameleon or whatever every time the system boots.
Are there just some files I can revert to in order to restore my system?