Beware of Skype malware and con tricks

I just got a call on Skype that was obviously designed to con people out of money or install malware. I have heard of people being called on the telephone with this sort of scam, but not by Skype. This is new to me. It goes like this:

"This is an important security notice. We have detected that your computer is not running properly and it may be infected with a virus/malware. Your security software has been deactivated and you and your computer are at serious risk. To reactivate your security software and repair the security problem go to www.blah blah..."

No doubt some malware or crapware will be installed that will hold your PC to ransom and cost an arm and a leg to remove. It didn't fool me for one second, but not everyone is as suspicious as I am of fake calls, emails, and pop-up messages.