[Blind-sysadmins] System loosing date

Hello, I'm dealing with a rather perplexing problem, at least I do when I get over to the box. An xp home machine keeps loosing it's date. It was doing some other stuff, like loosing it's boot order and atempting to network boot, so the CMOS battery was replaced, and that problem went away that is the problem of the network booting. Now in windows (not the system setup it knows it's date), sometimes it thinks it's date is like I just checked it Monday December 31 2001, 11:15 p.m. when the time was actually 8:15 p.m. or there abouts. Other times I've been told it thinks it's date is October 28 2065, I've never heard of a machine jumping forward in this instance. If anyone has any suggestions I'd appreciate them. Thanks. Dave.