You could also go with recovery console if u don't want to reinstall.(if U know a little cmd)
To get to recovery console:
Cd boot first in bios>press r >press enter or type password
Backup and replace the ntoskrnl file with another copy from Driver cache folder, or dll cache folder, etc
If that doesn't work then U have to copy the System, Software........ files from
C:\Windows\Repair to the Config folder in System 32.
I did this in more cases.