@Mr M
Hi,
You could try to boot to the Command Prompt (select it from the same Advanced boot menu you use for Safe Mode) and try chkdsk from there.
From the prompt type in chkdsk /f . That will check the file structure and fix problems with it and shouldn't take more than a few minutes.
If that runs to completion you can try chkdsk /r . That will go through the hard drive sector by sector and check for bad spots, fixing things where it can.
Also, deploy Latitude E6440 Windows 10 Driver Pack
https://www.dell.com/support/home/en-sg/drivers/driversdetails?driverid=m1gyf
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Hope above information can help you.
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