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.
