Yes, CMD need to be "run as administrator" for this - that's what "elevated" means.
hiberfil.sys is a hidden file - don't worry about it.
Can you attach a screen print showing "it is still shown as disabled in the power config menu"? Screenshots and Files - Upload and Post in Seven Forums
I thought hibernate is enabled by default on a Win 7 install.
I'm not sure why yours was not, or how it might have been turned off later if you didn't do it.