for some reason my windows xp time keeps jumping up an hour from the correct time. it's not set to sync with anything. i can set it to whatever time i want and when I reboot it changes to one hour from now. all updates (including dst update) are installed. im not on a network in fact I even disconnect the internet plug and it still does it. i set the time right in the bios and it jumps one hour when it boots up. what could be happening???