Duke can't get his Windows screensaver to activate. He can preview it, but it doesn't engage on its own. Leo says that there has to be a setting in the power options that are preventing it. It may be "wake on LAN" in the BIOS that's preventing it from going to sleep. So get into the BIOS and make sure the wake on LAN is turned off. Leo also suggests checking to see if a third party screensaver is causing a conflict. R/C desktop - personalization. Windows Key + L will also turn on screen lock. That could turn on the screensaver.
wake on LAN
Steve is having issues where his computer turns back on after he shuts it down. Leo says to look in your settings for "wake on LAN" and turn it off. It's a feature designed for IT networks to be able to turn on the computer remotely. You also want to be sure everything is shut down. There may also be a scheduled wakeup. Both features are in setup (BIOS). Turn on your computer and his F12. Once in the setup, go through the settings for those options and disable them. Could a hacker be turning it on? Leo says once it's shut down, nothing is running. So no, it isn't that.