I've had XP installed for about 2.5 years and have kept it up to date
with all patches and SP's.
Despite this, I am getting more and more 'blue screens' without a
consistent cause, so it seems that a clean install is called for. But,
as all updates have been done automatically, I have no CDs etc to
provide the updates, which must, by this time, amount to hundreds of
Mb.

Perusal of the Windows folder offers plenty of opportunities to
uninstall various updates, but I can't see any 'update' files or
folders.

Is there a way to save all the updates before formatting and
reinstalling Windows?

Tony.