I have commented a few times about all the fake AV going around the Internet. It appears that it morphs and adds "enhancements" that defends itself well. Turning off Microsoft Automatic Updates, not allowing you to browse to sites that will help you clean your PC, etc.
Well I ran across another blog today written by Gary Warner. He has a nice detailed post going into the details of how the bad guys are taking advantage of Google searches to raise their ratings that when people click on these links, it infects your PC with fake AV.
Click here to learn more on how the bad guys take advantage of things we use everyday, Google, and use it to propagate their nasty malware. Hey Nancy, this may be how it got installed on your PC!
Stay safe, have a Merry Christmas and a happy and safe New Year!