When trying to install a new Norton anti-virus (it failed to install) I was
informed that some system files had been replaced by unrecognizable versions
and I needed to go to the XP CD to re-install the correct versions. When
trying that I was told my SP1 system CD could not be used since the installed
system version was newer than the CD. I assume this is because of the update
to SP1. Also, all attempts at automatic security updates from Microsoft fail
with code 80242FFF.

My system is working okay right now but I figure I have a problem. I badly
need to install Norton anti-virus and can't. How can I replace/install the
correct files?

Carl
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Good on you and thanks to all!