Hermione may hex your computer.

The online security company, McAfee, names Emma Watson 2012's most dangerous celebrity on the Internet.  Your chances of landing on a website unloading malware, spyware or some other nasty virus are one-in-eight when you search gossip sites for the Harry Potter star, especially for fans looking for racy pictures.

For the first time ever, McAfee's "top ten" list of celebrities most likely to infect your PC are women, including Jessica Biel, Eva Mendes, Sofia Vergara and Halle Berry.  The only man to crack the top 20 is Jimmy Kimmel. 

McAfee warns cyber-criminals love to use celebrity names to lure you to a corrupted website.  The company urges computer users to download security software.