To quote Mr Langa.....'There are several reasons for the disparity in those error counts. First there's the matter of simple semantics: At one end of the spectrum, there are Registry errors that -- if not corrected -- may make a system unbootable or unstable, or that may cause some of your software to crash or to malfunction. But at the other end of the spectrum, there are trivial, transient Registry items that are intended for short-term use, that harm nothing when they go out of date, and that are ultimately self-correcting via normal Windows housecleaning. Naturally, counting these latter as "errors" drives up the count and lets a given piece of software generate impressive-looking stats; but removing those "errors" doesn't mean much in terms of a real benefit.' I think you will find most of the errors are self-correctable.