# Prevent Sending Spam with the Yahoo Account

emailspam-preventionvirusyahoo-mail

Today morning I found my Yahoo Mail account sent several emails with Subject re: and this body : this is crazy you should give it a look http://www.wanews15.net/biz/?news=9080205 to all my contact emails !!!
I have Eset Nod32(Up to date) Anti Virus, but it couldn't find any thing.
I've installed Microsoft Security Essential and it could find a virus. I remove it and I change my mail password.
What happened to my Yahoo Mail Account and what should I do ?

Edit :
My email password was 12 characters and I couldn't remember it , so I'm using RoboForm.
Is it possible that my Roboform password divulge. !!!

Edit 2 :
I've changed my yahoo mail password, but this morning I received Failure Notice for sending mail to some invalid mail addresses again, but there is a different this time, the sent mails didn't exist in my Sent Box. Is it a good thing or I have to do something else ?