Changes in the desktop time, are usually an indicator that the BIOS battery is in decline- so that I am aware of. The phenomenon I experienced recently would seem to point to more of a system thing. But what? On starting up on Sunday last, the time was an hour slow - exactly one hour not a few minutes . Corrected it and for as few days all was exactly as it should be Yesterday - exactly one hour out again- corrected it So far today - all is OK Any thoughts?