Thanks Matt for your response!
Yes, I do have 2 drives, an R/W and a DVD. When I
switched drives the SFC ran without a hitch!
Here are 2 suggestions:
1. SFC should indicate that no file errors were found at
its completion, if none were found instead of just
quitting. (I hope that this "missing" message is not
just another symptom of my problem
2. If the XP load drive has failed, then the SFC cannot
run--not good fault tolerant design. I suggest that XP
forget which drive was used for installation unless there
is some other reason . . .
Thanks for your help!
Mike