I upgraded to windows 10 from 7 through Microsoft's updater.
I used Windows 10 for setting up my calendar, by the time it restarted and

System reboots and ends up in black screen without getting into login page.
I tried to perform to open in safe mode of F8 , it didnt work
Then even try to press control key to check whether it takes to login , didnt happen

Could you please help with some support on it, since i need to access some important document in the laptop

Machine : Del Inspiron