I popped home at lunch-time and the phone rang. I only heard a few words before I impolitely put the receiver down, cutting poor 'Alan' off in mid call-centre spiel. He claimed to be from the Global Security Department and his next sentence would have been to say they had found a problem with my PC and its internet connection. Very soon he would have wanted remote access to fix it but instead would have installed malicious software.
I noticed a story in a local paper just recently where a gentleman was nearly taken in by such a scam but managed to stop it just in time. And this isn't the first time I have received such a call. It behoves us all to spread the word about this dangerous practice.