Installing Yosemite from 10.6.8 - Now stuck in OSX Installer

I have a White Macbook that was running Snow Leopard and I figured I would try to install Yosemite onto it because why not. Downloading was fine, installing seemed fine, but after the "22 minutes remaining" screen, the bar at the bottom doesn't move and then after about 5 - 10 minutes, a popup comes up saying I can't install this onto the disk. But then when clicking startup disk, it says I'm not allowed to boot up from that disk... leaving me with the only option of restarting. I've been trying different things in single-user mode, from the terminal, and I'm completely stuck as to how to upgrade or even just get back to the 10.6.8. Also, i managed to get to the OSX Utilities, where you can download the OS straight from there, and when I agree and go to click install to drive, it says it's locked. So stuck there too. Please help.

Do you have a backup?
Can you reboot normally? If you can boot into the single user mode, you are running an OS of some sort. Try booting in the Safe Mode to see if that works.
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