Sometime people find it hard to enable and disable the Hibernate feature in Windows Vista because it is not same as in windows XP. Here is a small DOS code that will easy up your job.
Type “CMD” without quotes.
powercfg /hibernate on : This will enable the hibernate option
How to Disable Hibernate option in Vista?
Disabling Hibernate option in vista is again the same. Follow the above procedure and Use” “Off” instead of “On”.
powercfg /hibernate off
Hope this small DOS trick was useful for you.