D Drive Appears to be Full When it Shouldn't


The size of my D drive is 397gb, it is currently showing that I have only 14gb free. There is about 20gb of stuff on my D drive which I can see, not including the roughly 46gb backup file. So, I can only account for 66gb of the 397gb. What should I do? I've ran ccleaner, malwarebytes, and AVG scanner. I've defragged the D drive, and I am currently running a check disk.

Is this a virus? If so, which virus detection software would you all recommend? My AVG is up to date, but I know some scanners work differently than others.

Thanks in advance for any replies and thank you for your time.

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