Hi yademokitu, your files and apps are intact . . .
What has happened is the boot configuration files has become corrupt and Windows does not know how to start!
Start your PC, just as the manufacturers logo disappears and Windows attempts to load, press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt . . . etc.
Please try each option one at a time, then see of Windows will boot . . .
Go to Troubleshoot - Advanced Option - Command Prompt
Run these commands one at a time:
bootrec /FixMbr
bootrec /FixBoot
bootrec /ScanOs
bootrec /RebuildBcd
Then reboot your System to see if Windows will boot . . .
If the commands will not run from the Windows Recovery Environment, you will need to run them by booting from Windows Installation Media . . .
Insert your Installation Media and boot from it
Do not Install Windows 10, instead click 'Repair this Computer'
The repair will fail, then click Advanced Options
Open Command Prompt and run the above commands one at a time:
Then reboot your System to see if Windows will boot . . .