davidwr writes to mention a BBC article looking at booby-trapped Windows codecs. While some codecs required for online videos actually let you watch your content, others are just excuses to infect your system with spyware or adware. As davidwr says: "Now virtual sex can make your computer sick." From the article: "Mr Robinson said many security firms were now logging instances in which spyware and adware firms are turning out software bundles that claim to roll together many popular codecs or just have the one needed to play a particular clip. Some of the codecs do help to play clips, but others are disguised as a variety of nuisance or malicious programs. Some rogue codecs plague users with pop-up adverts, while others invisibly install keyloggers that try to grab confidential data. "