If you try to clean up driver C " Windows driver ", it is very possible that you fine hibernate option disappears from shutdown list.
Unfortunately, Windows Vista doesn't support an GUI window that contains options about hibernate and re-enable. So we will learn together how to re-enable hibernate again throw CMD.
1. Open CMD in administrative mode, for more info click here.
2. type this
powercfg /hibernate on
and press enter.
That is it :)