Nothing terrifies me more than to receive a message from the Windows XP operating system telling me that one of my disks needs to be checked for consistency upon booting up. I have received no less than 4 of these messages this year alone, and it always happens on the C: drive. Files and/or directories will get deleted everytime when this happens. To restore the deleted files from my backup, I will first have to look in the corresponding "WinLogon" event in Event Viewer. The list of deleted files/directories are all there. I have been lucky so far as only noncritical files were deleted - Windows is still bootable in all cases. I always do a graceful shutdown of Windows before turning off the power to my computer. So this is something that should not be happening.