On another PC, see this archived post:
http://snipurl.com/4176.
1. Disconnect the WinXP machine from the internet...now!!!!!
2. On another machine, print out this reply and then see
http://www.cert.org/tech_tips/before_you_plug_in.html.
3. Also see...
Protect Your PC
http://www.microsoft.com/security/protect/
....and, courtesy of MVP Carey Frisch:
There are thousands of nasty computer viruses/worms looking for unprotected
computers. Your computer can be infected within a few milliseconds the
moment an internet connection is established if your computer is not
properly secured.
Apparently, your computer is now infected with the W32.Blaster.Worm or one
of its variants. This happened because you have not been using an internet
connection firewall and have apparently neglected to install the critical
updates available at the Windows Update website.
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If your computer is constantly attempting to shutdown or reboot, quickly go
to:
Start > Run and type: CMD , and hit enter. This opens the Command Prompt
window.
Then type: shutdown -a , and hit enter.
This should halt the rebooting problem.
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Then immediately turn-on Windows XP's built-in Firewall:
http://www.microsoft.com/security/protect/
What You Should Know About the Blaster Worm and Its Variants
http://www.microsoft.com/security/incident/blast.asp
A tool is available to remove Blaster worm and Nachi worm infections from
computers that are running Windows 2000 or Windows XP
http://support.microsoft.com/?kbid=833330
A security issue has been identified that could allow an attacker to
remotely compromise a computer running Microsoft Windows and gain complete
control over it. You can help protect your computer by installing this
update from Microsoft.
http://www.microsoft.com/downloads/details.aspx?FamilyId=2354406C-C5B6-44AC-9532-3DE40F69C074
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HTH...Please post back to this thread
~Robear Dyer (aka PA Bear)
MS MVP-Windows (IE/OE), AH-VSOP
Before You Connect a New Computer to the Internet
http://www.cert.org/tech_tips/before_you_plug_in.html