Fake anti-virus scams have been doing rounds for quite some time now. Hackers had previously used mediums, such as emails, websites etc. to carry out these scams. Now they have found another medium Skype.
Graham Cluley of Sophos has posted a video showing off the scam attempt in action. The MO is that of a common phishing attack, relying on inducing a sense of predicament on the victim. The automated call warns the victim that his/her computer is not protected and gives a link to follow in order to activate your computer protection’.
Following that link will take you to a web page that pretends to scan your computer. Not surprisingly, it will find some issues and will recommend you to buy their anti-virus software worth $19.95.
Obviously, when you get this kind of call, just disconnect it and don’t visit the websites that they mention.
Also, always use a reputed anti-virus, and more importantly make sure that it is fully updated. There’s no point in using an outdated antivirus. My recommendation for a good AV would be Microsoft Security Essentials as it is free and light on resources. But you can of course use other known anti-virus software, such as AVG and Avast.