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Does it shut down after a safe boot? (f8 repeatedly until menu appears, select "safe" and continue) If it works then something non-Microsoft is likely messing with you.
Are you confident in your virus status? What do you use?
With the system idle how busy is your processor as viewed from task manager?
What version of XP? Early XP (pre sp1) had issues with windows\system32\winlogon losing its mind.
Do you recall changing ACPI or other power related settings in the BIOS around the time this began?
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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