Drive inaccessible after running Disk Doctor

Thank you for being patient.
We request you to run "chkdsk.exe D: /f /r" from command prompt.
To run command prompt as administrator, follow the steps as mentioned in this (article).
To enter and run the command, refer this (article).
Once this is done, check the status with TuneUp disk doctor scan.

Hello Robert,
I'm sorry to hear about this. Could you share a screenshot of the error message "The file or directory is corrupted and unreadable" to assist you further?
You can post the screenshot here on your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.
Best regards,
Alok.

I ran Disk Doctor on my secondary Hard Drive (D:) and left to finish over night. The next day I check my computer and the drive is completely inaccessible, displaying the message "The file or directory is corrupted and unreadable" upon trying to access it.
When I restart my computer, it starts the disk checker and goes up to 11% before skipping straight to 64%, going up to 69%, skipping to 72% and then booting into Windows with the D: drive inaccessible.
I tried booting into Ubuntu from a flash drive and the D: drive was fine, but I can't access any of my files from within Windows.

Hello Robert,
I'm sorry to hear about this. Could you share a screenshot of the error message "The file or directory is corrupted and unreadable" to assist you further?
You can post the screenshot here on your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.
Best regards,
Alok.

User-added image

Thank you for being patient.
We request you to run "chkdsk.exe D: /f /r" from command prompt.
To run command prompt as administrator, follow the steps as mentioned in this (article).
To enter and run the command, refer this (article).
Once this is done, check the status with TuneUp disk doctor scan.