Is that Norton Disk Doctor, by any chance?
maybe try another disk utility?
http://service1.symantec.com/support...520?Open&src=w
http://www.tomshardware.co.uk/forum/...ty-descriptors
google search shows enough links for "NDD Security Descriptors" to raise a question over exactly what ndd is looking at and how it's interpreting it - could be it fixes errors and finds new ones or it's getting confused
Event Logs
Chkdsk will log error messages in the Event Viewer - System Log.
Chkdsk /f removes ACLs that are no longer used and reports this in the Event Viewer - Application Log.
dunno if that's any help finding the logs - I'd go by date and time; and if there are none listed, er, then there aren't any?.
Look for winlogon in the SOURCE column of the application event viewer. (you probably have already lol)
http://ss64.com/nt/chkdsk.html
might shed some light?