Hydraulicz

Re-Enable Hibernate Option in Windows Vista
Sumtimes it happens in Vista that the Hibernate option disappears. It might be from running the disk cleanup wizard and removing the hibernate files. This is due to a known bug in Vista that might not have been hotfixed already.
Turning it on is simple.
Type cmd in search in start menu and then right click on it and select run as administrator.
After cmd starts go to C:\>
Type powercfg /hibernate on and click enter.
Restart comp to reenable it.