Trailer Watchers BEWARE!!!
A report from PandaLabs confirms a newer and Expensive trojan going around, that's disguising itself as a "Harry Potter Trailer".
Now, chances are, if you go to a trailer that's directed to you FROM one of the HP fansites, you're in the clear. However, be careful when looking online. The report goes as follows:

This week’s PandaLabs report provides information about Harrenix.A, a dangerous Trojan that disguises itself as a trailer for the latest Harry Potter movie in order to infect users’ computers. Harrenix.A, is a Trojan that reaches computers disguised as a trailer for the forthcoming Harry Potter movie. However, when the user runs the file, instead of a movie being shown, the computer is infected by the Trojan. In order to avoid arousing suspicion, it shows an error message informing the user that as a certain codec is missing, the video cannot be shown, and advises the user to visit the official movie website. Once it has infected a computer, this Trojan downloads a dialer onto the computer, detected by PandaLabs as Dialer.KJD. This dialer is designed to connect users to the Internet through a more expensive connection than the one they have contracted.