Does my Macbook have a virus?

Yesterday my e-mail sent out virus e-mails. Then last night my internet was acting up. I can't access some websites, and they look distorted, etc...
My computer at work, which I do occasionally check my home e-mail from, was also acting up today (Smartboard crashing after a few minutes). When I left today tech support was running some checks on my computer.
Today when I got home my internet is still acting up and some websites are distorted or inaccessible. My e-mail was blocked as well due to a large amount of spam being sent out from it. I did change the password again and can access it, but it's still acting up.
Does this sound like a virus? I have an appointment with Genius Bar this weekend. I don't know what else to do besides take it in.

download ClamXav (free) and run a scan: http://www.clamxav.com/

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