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Remove Hibernation in Windows Vista
http://www.vistaarticles.com/articles/190/1/Remove-Hibernation-in-Windows-Vista
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Published on 12/9/2006
 
How to make hibernation unavailable on a computer that is running Windows Vista.

Remove Hibernation in Windows Vista

Hibernation is not made unavailable when you set the value of the Hibernate after setting to Never by using the Power Options item in Control Panel.

To make hibernation unavailable, follow these steps:

1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt, and then click Run as Administrator.
3. When you are prompted by User Account Control, click Continue.
4. At the command prompt, type powercfg.exe /hibernate off, and then press ENTER. 
5. Type exit, and then press ENTER. 

To make hibernation available, follow these steps:

1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt, and then click Run as Administrator.
3. When you are prompted by User Account Control, click Continue.
4. At the command prompt, type powercfg.exe /hibernate on, and then press ENTER. 
5. Type exit, and then press ENTER to close the Command Prompt window.