Hibernate mode uses the hiberfil.sys file to store the the current state (memory) of the PC, and since it’s managed by Windows.
If you want to delete use one of the following solutions
Click Start -> Al
l Programs -> Accessories
Right-click Command Prompt
Select Run as administrator
Grant permisssion to change system settings
In this privileged command prompt window, enter: powercfg -h off
Boot in Safe Mode and delete the file. Ensure that the hibernation is not enabled.If you still cannot delete it, use some other bootable disk and then delete it.