Well there is a worm going around Skype, you download the virus, it sends a message to all your friends like "Hey dude check out my new picture! <link>" The link goes to some random porn site like meatspin then you get infected.. Just a heads up discovered it myself.
The way to help prevent this is make sure your AV (antivirus) is up to date and make sure you have all of the features in it turned on. Also make sure you have the latest updates from Microsoft Update.
Well you get the virus by clicking on the link I think, so now that we know it's a bug we will most likely not click on the bug again. Thanks for warning us that it's back though. I have not seen it though.