Q: I’ve installed Windows Vista on my laptop but I do not see hibernation listed in the Shutdown options. How do I enable this?A: During Windows Vista installation, setup looks at your current memory and if the system has 4GB or greater, Windows will not enable hibernation by default. Many OEMs work around this by enabling hibernation in their pre-install images.
For enterprise and home users, you can use the following procedure to enable hibernation:
This will enable hibernation and unlike Windows XP you will not need to limit the RAM to under 4GB by using msconfig to enable hibernation in Windows Vista.-David Winkler