Virus posing as Windows Security Center?

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Thanks for the assistance. I guess I have something to keep me busy today!

Whenever I start WindowsXP, Windows Security Center opens a widow that seems is only to sell product - "SystemErrorFixer", "SystemDefender", and"SysCleaner". This seems to have started at about the same time I succumbed to a Wndows update for Windows Genuine Advantage (around the end of March). I also frequently get messages that "Internet Explorer has detected virus acivity" on many pages, including Symantec pages, my IP's home page, Windows Update, etc.. I eventually receive an unstable system message and windows closing in 60 seconds. Sometimes this occurs in just a few minutes after start-up, occasionally after a couple hours. It takes several atempts to run a complete scan with Norton anti-virus, but I managed to do so twice so far but with nothing detected. I think the scan completed only because a program not responding message was up and iterrupted the shutdown. Sometimes the shutdown message identifies lsass.exe in the message.

These are Mis-leading Application.

 

I would suggest running LiveUpdate, boot into Safe Mode and do a Full System Scan.  Make sure, beofre you go in to Safe Mode, that all boxes are Checked in the Manual Scanning sub-heading, which can be found under the N.I.S. tab, Settings, Norton Internet Security Options. 

 

If the above does not work, Click on these Web Links:

 

SystemDefender: http://www.symantec.com/security_response/writeup.jsp?docid=2007-092112-0037-99&tabid=3

SysCleaner: http://www.symantec.com/security_response/writeup.jsp?docid=2008-020818-4625-99&tabid=3