I've searched before posting this. The top answer was kind of my problem. I formatted and fresh installed Windows 10 (1803 version) then made a partition and installed Elementary OS. Everything works fine. I can boot, EOS menu appears, I can select and get into either OS without issues. However, I can't seem to access the Win partition from Elementary's file manager. It says Windows is hibernating or didn't shut down completely. This is not true since I A) first thing I did was turning off fast startup (also turned off fast boot from bios just in case) and B) shut down and turned off PSU / restarted Windows (supposedly Windows restart doesn't get affected by fast startup). Still no dice.
Then, from that top answer I tried to run the Linux command similar to chkdsk and it pulls up the same error, see down below (don't know how to make text box for the code, sorry):
Mounting volume... Windows is hibernated, refused to mount. FAILED
Attempting to correct errors... Processing $MFT and $MFTMirr...
Reading $MFT... OK Reading $MFTMirr... OK Comparing $MFTMirr to
$MFT... OK Processing of $MFT and $MFTMirr completed successfully.
Setting required flags on partition... OK Going to empty the journal
($LogFile)... OK Windows is hibernated, refused to mount. Remount failed: Operation not permitted
Now the option with -d also gives that error. So basically the problem is I can't "stop" Windows from hibernating although every option for that is turned off and I did fully shut down the OS. Also ran chkdsk and found no errors, however didn't solve my issue like it did with the person. Help? I need it to be W/R accessible since I use it to copy files and such back and forth. Having to restart, copy into USB and all is really slow for me. Thanks!