Hi, I am Dave, I will help you with this.
Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt... etc.
Go to Troubleshoot - Advanced Options - Command Prompt
Type this command and press Enter:
chkdsk C: /f /r
Wait for that command to complete, run this command 3 times, one at a time.
chkntfs /x c:
Type this command and press Enter:
fsutil dirty query c:
What is returned from that command?