Hiberfil.sys hidden system file is located in the root folder of the drive where the operating system is installed. The
Windows Kernel Power Manager reserves this file when you install Windows. The size of this file is approximately equal to how much random access memory (RAM) is installed on the computer.
The computer uses the
Hiberfil.sys file to store a copy of the system memory on the hard disk when the
hybrid sleep setting is
turned on. If this file is not present, the computer cannot hibernate.
Follow complete details on this link as Microsoft support
Use following command to turn of hibernation
powercfg.exe /hibernate off
and off hybrid sleep setting from
Advanced Power Settings.. See the @harrymc answer to where to do this..
If you are having some issues with windows then use
Microsoft Fixit. it is nice utility. I was using this with my Genuine Windows XP operating system.