Hi
If you don't have any luck booting in an option is to create a Ubuntu disk and use it to log into your computer.
Just download the Ubuntu ISO and burn it to a disk using ImgBurn.
I always have an up to date disk handy, I can't tell you how many computers I booted with it.
It will let you save everything to an external or alternate internal drive.
It will boot pretty much any computer that doesn't have a hardware issue.
It also comes in handy doing things that Windows won't let you do, like deleting a file when Windows say no. LOL
For universal use chose 32bit but if you computer is 64 you can use that.
You can install it from the disk, but you don't have to, the disk will boot into the Ubuntu interface and let you move files...