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When visiting Classmates.com I got this message: Mozilla security has found critical process activity on your system adn will perform fast scan of system files. This seemed bogus so I cancelled the scan and download that was taking place. Was this legit?

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Message was coming from http://tegolhai.co.cc/index.....

A Mozilla Security window opened and started a virus scan listing several viruses. And a downloaded file window popped up asking that I complete the downloading of the file.

Message was coming from http://tegolhai.co.cc/index..... A Mozilla Security window opened and started a virus scan listing several viruses. And a downloaded file window popped up asking that I complete the downloading of the file.

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That is a fake security scan, not from Mozilla. If you downloading anything, don't install it. If you did install it, run a full scan with your anti-virus application.