To enable hibernation, your computer is constantly updating your current state to disk so that if you hibernate the computer, it can come back up in the same state. If you don't use the hibernate feature on your Vista computer, you can speed up your computer by disabling this feature. To disable hibernation, go to the Control Panel and then Power Options. Click Change Plan Settings and then click on Change Advanced Power Settings. Expand the Sleep selection and then expand the Hibernate After selection. Change the selector down to zero, click Apply and you will have disabled hibernation. If you want to re-enable hibernation, you can just reverse this process.