Missing NTOSKRNL.exe Error on a black screen

Any concern please! I was very busy and exhausted doing some researches for my thesis last night and I forgot to turn off my Dell laptop. When I woke up in the morning, I already saw a black screen. When I started it, only this message appeared “Windows Root>System32NTOSKRNL.exe. Re-install a copy of the above file. ”
I restarted my PC again with the hope of reaching the Safe Mode and Setup options, but I didn’t. I also tried of rebooting it through the CD-ROM but it nothing significantly happened. What is the problem on my laptop? I cannot remember that I had mounted any hardware or uninstalled any software.
Any help is appreciated.
