Stuff like this has been going around since the Internet first became popular... Bottom line is, know what you're opening and make sure you've got antivirus/anti-spyware software. However, never assume that you're safe from anything.
I'm also of the opinion that people should really be educated before they get a computer and go online... Just like driving a car, you're not the only one who you're endangering. With viruses and the like, you could be spreading e-harm without even knowing it.
