If User Account Control prompts you, click Continue.
In the search results list, right-click Command Prompt, and then click Run as Administrator.
Click Start, and then type cmd in the Start Search box.
To delete the Hiberfil.sys file and make hibernation unavailable, follow these steps: If this file is not present, the computer cannot go into hibernation. The computer uses the Hiberfil.sys file to store a copy of the system memory on the hard disk when hibernation is turned on. This file's size is approximately equal to how much Random Access Memory ( RAM) is installed on the computer. The Windows Kernel Power Manager creates this file when you install Windows. The Hiberfil.sys is a hidden system file located in the drive's root folder where Windows is installed. So when I noticed that my version of Windows 7 still had the Hiberfil.sys file and I am not using hibernation, it was time to remove this file and regain that hard drive space back ( in my case, 8 Gb) I need to be able to walk into my office and have it ready to go. If you're a hardcore computer user like me, you have your system running 24/7-no screen saver or power saver options ( I turn off the monitors when not in use).