MAILER-DAEMON Virus problems??HELP?

I was on face-book today at 4:30 pm doing a relative app and the my page closed and it said "warning! your computer has a virus!" and offered some free service protection software. I declined it and everything was fine. So I ran a virus check with MY own virus protection. And when i went to go check my... show more I was on face-book today at 4:30 pm doing a relative app and the my page closed and it said "warning! your computer has a virus!" and offered some free service protection software. I declined it and everything was fine. So I ran a virus check with MY own virus protection. And when i went to go check my e-mails i deleted spam, checked new, and refreshed the page. the i got an e-mail that said it was from 1 minute ago. it was from "MAILER-DAEMON@yahoo.com" they even spelled "Demon" wrong...and the subject said "Failure Notice" I didn't want another virus so i deleted the e-mail without reading it...and now im kinda scared that my computer is at risk...
Any advice? 10 points to best answer...Thanks.
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