Can you boot into Safe mode and do you see any cursor blinking on the screen?
If you, then I would recommend you to restore the system through a repair CD if you have one. If you don't have such, you could try to find or make a bootable USB flash drive and try with it. For that, you must enter the BIOS settings and manually change the boot priority and set it on the USB ports.
The second thing that comes up into my mind is to restart your computer, go after pressing the appropriate F key to navigate to the Windows menu. From there you should have access to restore your OS. Open the Command Prompt in safe mode and run the command:
sfc / scannow
Then press Enter and wait for your OS to be repaired.
If you cannot access this menu while you reboot, enter the BIOS settings. There, navigate to the storage menu to verify that your hard drive is as a first boot priority. If not, you have to set it.
Once you have done this please, come over here to tell me what happened. Cheers.