HIBERFIL.SYS is a file the system creates when the computer goes into
hibernation mode. Windows uses the file when it is turned back on. If you
don't need hibernation mode and want to delete the file you need to turn the
hibernation option off before Windows will allow you to delete the file...
* Start | Control Panel | Power Options
* Go to the Hibernate Tab
* Uncheck the Enable Hibernation box if you don't need the hiberation
function
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Have a nice day,
Jonathan Yaniv
Microsoft Windows Liveâ„¢ Butterfly Expert