For some reason the hibernate function is not enabled in either Windows Vista or Windows 7 by default (even if your BIOS supports it). On top this, enabling this power saving feature isn’t as simple as marking a check box.

If you want to make use of this rather nice function then here is how to do it in Windows Vista and Windows 7.

I find this feature especially useful on laptops because it essentially allows you to snapshot your current session and resume from exactly where you left off. Additionally, the bootup time from hibernation is usually much faster than a cold boot.