One of the most common problem in Windows Vista is "Missing Hibernate option in startmenu". I get many mails asking for "how to enable the hibernate option in Vista?".
Actually its a known issue in Vista. The hibernate option disappears whenever you run "Disk Cleanup" because Disk Cleanup wizard also removes Hibernate files. So if you use Hibernate then make sure you deselect "Hibernattion File Cleaner" option from the list in future.
Anyway its very easy to re-enable missing Hibernate option by following these simple steps:
1. Click on "Start button -> All Programs -> Accessories". Right-click on "Command Prompt" and select "Run As Administrator". If you are prompted to enter password, enter the password and continue. You can also open Command Prompt in Administrator mode by typing "cmd" in Startmenu Search box and press "Ctrl+Shift+Enter".
2. Now provide any of following commands:
powercfg /hibernate on
powercfg -h on

3. Exit command prompt and Hibernate option should appear in Startmenu.
This article was posted by VG in following section: Troubleshooting, Windows Vista.
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Dv
thanks so much VG, it's genius's like you that make the world easier for idiots like us!
VG
^^ We all are human beings and we all make mistakes. ;)
malena
LOVE YAAA SOO MUCH!
THX!!!
Ady
OMG! Thank you sooooooo much. I have been trying to figure this out forever! THANK YOU!!!!!
K
Thanks!
Wonder why it disappeared in the first place.
Tony
thank you :)
finally a person who knows this option
thank you thank you thank you :)
SooSweet
you are a life saver :)
Dnyanesh
It didn't work for me! :(
Ray
thanks for the solution on Hibernate
Trevor
Thanks soo much, this helps a ton. the people at hp support don't know anything, they think this is a random occurance. anyways thanks!!