How to mount my NTFS drive?

I was able to use this earlier, but after reinstalling a bunch of games, I noticed my drive said it was read only, and I am unable to add or edit any files. It works perfectly fine when I use it in Windows, and when restarting (for the first time since I flashed the HTPC nvidia iso) it took me to the os tree, and the first option had failed for a reason i cant remember, and had to pick the second option
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