If you want to remove hiberfil.sys from your Windows 8 installation, you must first disable hibernation.
1. Right click any where on the start screen
2. Click on All apps
3. Right click cmd and click Run as administrator
Open explorer and navigate to [C:\Windows\System32] right click cmd.exe and click on "Run as administrator".
2. Enter: powercfg -h off
3. Normally the file will now be deleted, if it isn’t you can manually remove it.
If you don’t run the command prompt with elevated privileges, you will get the error:
[An unexpected error condition has occurred. Unable to perform operation. You may not have permission to perform this operation.]