I have an old desktop which has recently been reformatted and loaded with Win XP Pro SP3. It has all security patches installed. I don't use this computer, I just keep it around for a backup so I keep it shutdown. But every afternoon it will start up all by itself, it does this as regular as clockwork. It is not connected to my network and has very little software installed. I can't figure out why it starts up itself. Anybody ever seen this or have any clues?