Is this a new XP system, or an XP upgrade from Windows 98/ME, etc?
How many hard drives do you have, and how many partitions on each drive?
Where did the system come from and what changes have you made to it?
I am running XP Pro, a few days ago I noticed that the clock was not only showing the time but the day. A few days later the clock returned to normal, then icons started disappearing from the task bar notification area. At times I could restart the computer and the icons were back. Today I restarted and used the F8 function, on the OS choices menu, I had a choice between XP Pro, and Windows (default). I don't know where (default) came from. When I boot to (default) several things do not work correctly, but in Pro everything is as it should be. But of course it automatically defaults to (default), what do I need to do?