Hi bobandconnie and welcome,
Personally, I've never encountered this error, but it's a read error occurring in express DL mode,"...Error_SectorNotFound...". It's likely that there is a physical defect, ie., dirt, scratches, etc., on the source disc or perhaps there is a "bad" sector as part of the copy protection. If you post back with some specifics, maybe we can nail it down a little better.
If you take a look at the "help" sticky above, Mack ( ) has taken the trouble to post many helpful hints and links, including error codes lists. Note post #4.