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now2010

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Computer constantly rebooting

I got a client that has a  windows xp desktop that's consistently rebooting on its own since several days ago. It shuts down and turns back on by itself. It has Norton antivirus up to date on it. So I don't think it's a virus. What could be the problem do you think?

Thanks.
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askurat1
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Well a couple of things but just because it has virus software doesn't mean it couldn't have spyware or malware. Have you tried booting into safemode?
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cerrmj

Do you know if XP SP3 was recently installed (like when this happened) and the system has an AMD processor?  If so, take a look at this:
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=pv-60484-2
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jonahzona
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Check the Userinit.exe in Registry hive using the BartPE Boot CD, link below
HKEY_USERS \ MyXPHive \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon

How to edit the registry offline using BartPE boot CD ?
http://windowsxp.mvps.org/peboot.htm

I hope that would help

Sudeep
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I disabled reboot on system startup and the problem went away. thanks.