You can download the FREE AVG antivirus here that updates everyday.
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free.grisoft.com]
But there are no trojans coming off this site. BUT, if anyone pressed on of the links from the pornspam links, more than likely it will try to install a trojan .exe on your computer from the target website. There are zillions of them out there now.
So never press a suspect link, as it is most likely going to try to install a trojan, or something else.
But everyone MUST have an antivirus at all times, and a firewall, anti-spyware, etc.
Get the FREE AVG antivirus posted above, its good.