Unable to mount Windows partition - fast boot is already off - still get the problem

Question

i have installed windows 8.1 and ubuntu on my new computer, and get the following error when i try to mount the device. I already googled and turned all the hibernation / fastboot options off, but i still have this problem. The option secure boot is disabled in the UEFI-BIOS aswell. Does anyone have an idea, what might cause the problem? And is there a chance to overwrite the Ubuntu error and mount the device -w to do some testing?

Thank you,

here's the error-message:

Error mounting /dev/sda2 at /media/simon/9A3E3EEF3E3EC453: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda2" "/media/simon/9A3E3EEF3E3EC453"' exited with non-zero exit status 14: Windows is hibernated, refused to mount.
Failed to mount '/dev/sda2': 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.

Solution

I had this issue and found the solution here.

The only surefire method of disabling Hibernate, and thus removing hiberfil.sys, on Windows Vista and Windows 7, is through the command prompt and the following steps:

1. Open a command prompt with administrative privileges.
2. Enter "powercfg.exe -h off" (see Figure D).
3. Exit the command prompt.

I had fast boot and hibernate unchecked but apparently that hiberfil.sys was still in my file system! Open a command prompt within Windows in administrator mode and run "powercfg.exe -h off". This should delete that file if you have it and hopefully solve the issue.

Comments

[Simon]

Unfortunately I have tried this already after i googled for the problem. It still does not work at all. Here's my gparted screenshot: db.tt/dmwurzno - i guess i have not enough reputation to post images.

[precise]

please Provide context for links "...Always quote the most relevant part of an important link, in case the target site is unreachable or goes permanently offline."

[Hellreaver]

Adding an answer directly contradicting what the asker has already done suggests you think they're of inadequate skill to perform the task, and recognize they did it.