Hi
First I would run the diagnostic's built into your Laptop.
Restart the computer.
As the computer boots, press F12 when the Dell Splash Screen appears.
When the Boot menu appears, highlight the Boot to Utility Partition option or the Diagnostics option and then press to start the 32-bit Dell Diagnostics.
Press the Tab key to highlight Test System.
If the hard drive is failing then you will need to get it replaced. Perhaps at the same time have Windows 10 reloaded as well.
Here is the instructions on how to restore the system image.
To use your system image to restore your PC, open up the new Windows 10 Settings menu and go to Update & recovery. Under Recovery, find the Advanced startup section, and click Restart now. When your PC restarts, go to Troubleshoot, Advanced Options, and then choose System image recovery. Or you can run from the windows 10 install media