How to disable hibernation and remove hiberfile.sys file

To delete this file, you have to use the command prompt to manually turn off hibernation.
If you turn off hibernation via Power Options, it will not delete the actual file itself.

1. Click Start
2. Open a command prompt in Windows 7 by typing command in the search box
3. Right click Command Prompt and choose Run as Administrator 
4. To turn off or disable hibernation, type the following command at the prompt:
1. powercfg –h off 
5. This will disable hibernation and will remove the hiberfil.sys file from your system freeing up the space equal to amount of System RAM.