Hiberfil.sys can use several GB of hard disk space. Delete the file, and it will likely return. Bill Detwiler explains how to get rid of it for good. In a previous TR Dojo Challenge question, I asked ...

You will need admin permission and enough knowledge to change settings in the BIOS. Windows stores the state of the computer or hibernation into a file with the name hiberfil.sys. It would be best to ...