This question already has an answer here:
Today just when I started installing a new copy of Windows 10 on my laptop I realised that I hadn't retrieved the windows product key from the hard disk.
I quickly took out the USB stick which I was using to install windows and forcibly shutdown my laptop using the power button.
Now I can't boot into Windows so I made an Ubuntu bootable usb stick to access the files from the hard disk but the following message comes up:
Error mounting /dev/sda4 at /media/ubuntu/Data: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=999,gid=999" "/dev/sda4" "/media/ubuntu/Data"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sda4': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option.
What can I do in this situation? Is it possible to contact the manufacturer to get the product key?