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Frequent reboots for no reason are also a classic symptom of the W32.Welchia.worm, also called Nachi worm, and MSBLAST.D. The worm can hit regardless of what model mobo you have. I had that worm about 2 weeks ago, what a shock! The unexpected reboot is when it started. On mine the worm showed up in DLLHOST.EXE, I think it was. Might have been SVCHOST.EXE. The LAN was going crazy for no apparent reason.

Update your virus definitions, pull your LAN, and run a virus scan (you do all have antivirus tools and firewalls, right? A search of PCCillin's site only showed solutions for MSBLAST.A, not the .D variant, but you could give it a try. I hear PCCillin periodically kills your LAN, though. Personally I recommend Symantec (Norton) Antivirus, and a Symantec Firewall, looks like Symantec Norton Internet Security 2004 is the way to go today, has what u need at under $70.

There's Microsoft info buried in here about preventive patches, and removal tools, for this worm and its variants.

Hope this helps,

-clintfan
 
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