How to Remove Hiberfil.Sys from XP

Using the Control Panel

1. 
   Open the Windows Control Panel
2. 
   Double-click Power Options
3. 
   Click the Hibernate tab, de-select the 'Enable hibernate support' check box, and then click Apply.
4. 
   Restart your computer and hiberfil.sys should be automatically deleted (this is not always the case - simply delete it if Windows didn't do it for you).
5. 
   If you change your mind in the future and would like to use hibernation, go back to the Hibernate tab as described in the first three steps and check the box 'enable hibernation'.