I some times leave an item downloading when I leave my PC,but find that the PC as closed down before item as finished downloading, guess this is a energy saving feature.
How do I override this or extind the period before shut down?
Go in to the control panel. In there you'll see power options. Click that. At the end of each power setting, you see, change power settings. Click that. In there you'll be able to change when you computer goes to sleep, turn off, etc etc.