Hi. EASIEST method time-wise :
1) Download a Puppy linux version [
www.puppylinux.com] (Xenial for computers from past 10 years) & then download the YUMI utility [
www.pendriveapps.com].
Use the YUMI utility to make the bootable Puppy linux flashdrive (128Gbs should clear most of Your files well unless You're a heavy movie downloader).
Boot from the flashdrive & "mount" sda1 by clicking on it once. That's Your Windows drive, if it's not it will be one of the "sda#" drives, just click each one to find the Windows drive.
Copy the files, or You can plug in an additional external USB harddrive up to 2Tbs to copy Your files onto.
Then You can try the Windows repair utility from an installation disc without losing what You need to keep.
G'Luck!!!