If it’s just the dirty flag (it was uncleanly unmounted) you can try
ntfsfix -d /dev/sdc1
Still probably better to boot into Windows and let it deal with it (ntfs tools are still reverse engineered stuff after all), and check journalctl before doing it, but it works in a pinch.
Disagree on picking RPM distros for an absolute beginner (this is what the image is about at least). SUSE maybe but you don’t want a newbie having to deal with US patent bullshit and especially SELinux. Similarly, no newbie will ever pic a barebones WM as a first time user.