you’re not infected if…
your computer has not neccessarily been infected by a virus if you see the image below.

what the image show is that the anti-virus software, in this case, symantec’s norton anti-virus, has caught several e-mail messages containing either a virus, a trojan or worm and has deleted the offending attachments. the software is just informing you about the event and what it did.
what it also means is that you’re getting a lot of spam which you can start getting rid of by blocking the sender.
