Windows 10: Resetting computer for resale and encountered: Fixing D: Stage 3: 100% 0 of 0; Total: 99%;...

Hello would really appreciate some help with the following issue which is proving to be a real headache..Yesterday I reset my computer to factory defaults, wiping all files on the PC so that I can sell it as I no longer use it. The laptop went through all of the usual processes over night until it was stuck on ''Fixing D: Stage 3: 100% 0 of 0; Total: 99%; ETA: 0.00.0'' for hours. After looking for solutions online I decided to force shut down the laptop. Once restarted, the laptop is trying to fix the drives again, if I press any key to bypass this, im greeted with the following error: ''

:)

 

Fixing (H Stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00

My pc (Lenovo) was very slow for week espicially today, I decided to restart it and then start fixing then it stuck at this stage:

Fixing (H Stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00

It took 12 hours and I am still waiting.

what is the best solition?

Thanks

 

fixing (C stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00.

My PC was running very slowly and I was unable to really get to a regular power off so I had to do a manual shut down. When I turned the computer back on I was greeted with the automatic disk check and repair. I'm currently at the state of the title fixing
(C stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00. and it has been hanging for over 30 minutes thus far. Is this a hanging loop or should I wait for it to try to work itself out? What would be my next steps in order to proceed if this doesn't complete?

 

Stuck on fixing (E stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00.

I turned my computer off one night after it was working fine, came home from work, turned it on, and it says:

Fixing (E Stage 1: 60% (x of x); Total: 87%; ETA: 0:xx:xx

It was on Stage 3: 100% (0 of 0); Total: 99%; ETA: 0:00:00 for 3 hours. I turned off the pc, drained the power, cleaned as much dust as i could with electronic duster, turned it on, and im back at square one. This isnt my boot drive, its a 1 TB HDD and its
only used to store music files or video files. I use it maybe twice a week at most. Is there any way to troubleshoot this?