before doing anything else, you may want to backup your pictures and important files to an external or usb drive. you should have no problems doing that in safemode.
in safemode, did you try restoring to a previously saved restore point? It will not touch personal files.
I just moved all my computer parts into a new tower since my previous one was too large. My computer worked completely fine before I had switched towers. Moving everything in went smoothly, except for when I turn it on my computer boots on and into Windows 8.1 safe mode. I've tried every selection besides resetting my computer (I have pictures and important files on there) and none of them work, they all just bring me to the same "choose an option" screen. Could it be that one of the internal wires isn't correctly plugged in or plugged into the right spot?