I just got a MAC in August because I was told they are "virus free"... but now I have a virus on my computer and I don't know what to do. I think it is related to my yahoo account. Sometimes the screen will get black and it will say "Movies - Front Row ... " and some other options. Then it will get normal again. When I send emails to multiple contacts, a lot of wierd symbols appear under the email addresses. I use an unsecured network in the building. This is also worrying me. Can other people see what I am doing? Could they have access or have installed a virus in my computer? I already installed the CLAMX, it got two viruses, but this "movie" thing keeps appearing and the email contacts is still the same. I'm worried about buying an anti virus online because of this problem. Please help! Thank you!