The last know good confirguation is accessed via safe mode and, basically,
is the last time the resgistry was saved - more than likely yesterday,
because you have used the pc since. If the problem has persisted for a few
days the last known good configuration will not be of use.
Are you experiencing a specific problem or is it simply a case that you feel
the registry needs attention?
While XP home or Pro do not have their own registry checkers there are third
party checkers available, but, as Galen has pointed out, registry editing is
best left to human hands rather than software applications. Software
registry checkers can delete options that you do not want removing, thus
causing other problems.
--
John Barnett MVP
Associate Expert
http://xphelpandsupport.mvps.org
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